1562423 - Black background painted in error

Status: RESOLVED WORKSFORME

(Firefox :: Untriaged, defect)

Description

[Ronald Tilby]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0

Steps to reproduce:

Beginning with the 29 June 2019 nightly, I frequently see portions of the screen painted with a black background.
Sometimes the black background will just flash on the screen, other times it persists for a few seconds then the display returns to normal.

Here's the about:support information from my machine:
Application Basics

Name: Firefox
Version: 69.0a1
Build ID: 20190629100032
Update Channel: nightly
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0
OS: Windows_NT 10.0
Launcher Process: Enabled
Multiprocess Windows: 2/2 Enabled by default
Remote Processes: 9
Enterprise Policies: Inactive
Google Location Service Key: Found
Google Safebrowsing Key: Found
Mozilla Location Service Key: Found
Safe Mode: false

Crash Reports for the Last 3 Days

Nightly Features

Name: Firefox Monitor
Version: 3.0
ID: [e-mail]

Name: Firefox Screenshots
Version: 39.0.0
ID: [e-mail]

Name: Form Autofill
Version: 1.0
ID: [e-mail]

Name: Web Compat
Version: 4.3.1
ID: [e-mail]

Name: WebCompat Reporter
Version: 1.1.0
ID: [e-mail]

Remote Processes

Type: Web Content
Count: 6 / 8

Type: Extension
Count: 1

Type: Privileged About
Count: 1

Type: GPU
Count: 1

Extensions

Name: Amazon.com
Version: 1.1
Enabled: true
ID: [e-mail]

Name: Bing
Version: 1.0
Enabled: true
ID: [e-mail]

Name: DuckDuckGo
Version: 1.0
Enabled: true
ID: [e-mail]

Name: eBay
Version: 1.0
Enabled: true
ID: [e-mail]

Name: Google
Version: 1.0
Enabled: true
ID: [e-mail]

Name: Twitter
Version: 1.0
Enabled: true
ID: [e-mail]

Name: Wikipedia (en)
Version: 1.0
Enabled: true
ID: [e-mail]

Security Software

Type: Norton 360

Type:

Type: Norton 360

Graphics

Features
Compositing: WebRender
Asynchronous Pan/Zoom: wheel input enabled; scrollbar drag enabled; keyboard enabled; autoscroll enabled
WebGL 1 Driver WSI Info: EGL_VENDOR: Google Inc. (adapter LUID: 0000000000009d7d) EGL_VERSION: 1.4 (ANGLE 2.1.0.b0a9c45400d2) EGL_EXTENSIONS: EGL_EXT_create_context_robustness EGL_ANGLE_d3d_share_handle_client_buffer EGL_ANGLE_d3d_texture_client_buffer EGL_ANGLE_surface_d3d_texture_2d_share_handle EGL_ANGLE_query_surface_pointer EGL_ANGLE_window_fixed_size EGL_ANGLE_keyed_mutex EGL_ANGLE_surface_orientation EGL_ANGLE_direct_composition EGL_NV_post_sub_buffer EGL_KHR_create_context EGL_EXT_device_query EGL_KHR_image EGL_KHR_image_base EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_gl_renderbuffer_image EGL_KHR_get_all_proc_addresses EGL_KHR_stream EGL_KHR_stream_consumer_gltexture EGL_NV_stream_consumer_gltexture_yuv EGL_ANGLE_flexible_surface_compatibility EGL_ANGLE_stream_producer_d3d_texture EGL_ANGLE_create_context_webgl_compatibility EGL_CHROMIUM_create_context_bind_generates_resource EGL_CHROMIUM_sync_control EGL_EXT_pixel_format_float EGL_KHR_surfaceless_context EGL_ANGLE_display_texture_share_group EGL_ANGLE_create_context_client_arrays EGL_ANGLE_program_cache_control EGL_ANGLE_robust_resource_initialization EGL_ANGLE_create_context_extensions_enabled EGL_ANDROID_blob_cache EGL_ANDROID_recordable EGL_EXTENSIONS(nullptr): EGL_EXT_client_extensions EGL_EXT_platform_base EGL_EXT_platform_device EGL_ANGLE_platform_angle EGL_ANGLE_platform_angle_d3d EGL_ANGLE_device_creation EGL_ANGLE_device_creation_d3d11 EGL_ANGLE_experimental_present_path EGL_KHR_client_get_all_proc_addresses EGL_KHR_debug EGL_ANGLE_explicit_context
WebGL 1 Driver Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics 4600 Direct3D11 vs_5_0 ps_5_0)
WebGL 1 Driver Version: OpenGL ES 2.0 (ANGLE 2.1.0.b0a9c45400d2)
WebGL 1 Driver Extensions: GL_ANGLE_client_arrays GL_ANGLE_depth_texture GL_ANGLE_explicit_context GL_ANGLE_explicit_context_gles1 GL_ANGLE_framebuffer_blit GL_ANGLE_framebuffer_multisample GL_ANGLE_instanced_arrays GL_ANGLE_lossy_etc_decode GL_ANGLE_memory_size GL_ANGLE_multi_draw GL_ANGLE_multiview_multisample GL_ANGLE_pack_reverse_row_order GL_ANGLE_program_cache_control GL_ANGLE_provoking_vertex GL_ANGLE_request_extension GL_ANGLE_robust_client_memory GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 GL_ANGLE_texture_usage GL_ANGLE_translated_shader_source GL_CHROMIUM_bind_generates_resource GL_CHROMIUM_bind_uniform_location GL_CHROMIUM_color_buffer_float_rgb GL_CHROMIUM_color_buffer_float_rgba GL_CHROMIUM_copy_compressed_texture GL_CHROMIUM_copy_texture GL_CHROMIUM_sync_query GL_EXT_blend_func_extended GL_EXT_blend_minmax GL_EXT_color_buffer_half_float GL_EXT_debug_marker GL_EXT_discard_framebuffer GL_EXT_disjoint_timer_query GL_EXT_draw_buffers GL_EXT_float_blend GL_EXT_frag_depth GL_EXT_instanced_arrays GL_EXT_map_buffer_range GL_EXT_occlusion_query_boolean GL_EXT_read_format_bgra GL_EXT_robustness GL_EXT_sRGB GL_EXT_shader_texture_lod GL_EXT_texture_compression_bptc GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_s3tc_srgb GL_EXT_texture_filter_anisotropic GL_EXT_texture_format_BGRA8888 GL_EXT_texture_rg GL_EXT_texture_storage GL_EXT_unpack_subimage GL_KHR_debug GL_KHR_parallel_shader_compile GL_KHR_robust_buffer_access_behavior GL_NV_EGL_stream_consumer_external GL_NV_fence GL_NV_pack_subimage GL_NV_pixel_buffer_object GL_OES_EGL_image GL_OES_EGL_image_external GL_OES_compressed_ETC1_RGB8_texture GL_OES_depth32 GL_OES_element_index_uint GL_OES_get_program_binary GL_OES_mapbuffer GL_OES_packed_depth_stencil GL_OES_rgb8_rgba8 GL_OES_standard_derivatives GL_OES_surfaceless_context GL_OES_texture_border_clamp GL_OES_texture_float GL_OES_texture_float_linear GL_OES_texture_half_float GL_OES_texture_half_float_linear GL_OES_texture_npot GL_OES_vertex_array_object OES_compressed_EAC_R11_signed_texture OES_compressed_EAC_R11_unsigned_texture OES_compressed_EAC_RG11_signed_texture OES_compressed_EAC_RG11_unsigned_texture OES_compressed_ETC2_RGB8_texture OES_compressed_ETC2_RGBA8_texture OES_compressed_ETC2_punchthroughA_RGBA8_texture OES_compressed_ETC2_punchthroughA_sRGB8_alpha_texture OES_compressed_ETC2_sRGB8_alpha8_texture OES_compressed_ETC2_sRGB8_texture
WebGL 1 Extensions: ANGLE_instanced_arrays EXT_blend_minmax EXT_color_buffer_half_float EXT_disjoint_timer_query EXT_float_blend EXT_frag_depth EXT_shader_texture_lod EXT_sRGB EXT_texture_compression_bptc EXT_texture_filter_anisotropic OES_element_index_uint OES_standard_derivatives OES_texture_float OES_texture_float_linear OES_texture_half_float OES_texture_half_float_linear OES_vertex_array_object WEBGL_color_buffer_float WEBGL_compressed_texture_s3tc WEBGL_compressed_texture_s3tc_srgb WEBGL_debug_renderer_info WEBGL_debug_shaders WEBGL_depth_texture WEBGL_draw_buffers WEBGL_lose_context
WebGL 2 Driver WSI Info: EGL_VENDOR: Google Inc. (adapter LUID: 0000000000009d7d) EGL_VERSION: 1.4 (ANGLE 2.1.0.b0a9c45400d2) EGL_EXTENSIONS: EGL_EXT_create_context_robustness EGL_ANGLE_d3d_share_handle_client_buffer EGL_ANGLE_d3d_texture_client_buffer EGL_ANGLE_surface_d3d_texture_2d_share_handle EGL_ANGLE_query_surface_pointer EGL_ANGLE_window_fixed_size EGL_ANGLE_keyed_mutex EGL_ANGLE_surface_orientation EGL_ANGLE_direct_composition EGL_NV_post_sub_buffer EGL_KHR_create_context EGL_EXT_device_query EGL_KHR_image EGL_KHR_image_base EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_gl_renderbuffer_image EGL_KHR_get_all_proc_addresses EGL_KHR_stream EGL_KHR_stream_consumer_gltexture EGL_NV_stream_consumer_gltexture_yuv EGL_ANGLE_flexible_surface_compatibility EGL_ANGLE_stream_producer_d3d_texture EGL_ANGLE_create_context_webgl_compatibility EGL_CHROMIUM_create_context_bind_generates_resource EGL_CHROMIUM_sync_control EGL_EXT_pixel_format_float EGL_KHR_surfaceless_context EGL_ANGLE_display_texture_share_group EGL_ANGLE_create_context_client_arrays EGL_ANGLE_program_cache_control EGL_ANGLE_robust_resource_initialization EGL_ANGLE_create_context_extensions_enabled EGL_ANDROID_blob_cache EGL_ANDROID_recordable EGL_EXTENSIONS(nullptr): EGL_EXT_client_extensions EGL_EXT_platform_base EGL_EXT_platform_device EGL_ANGLE_platform_angle EGL_ANGLE_platform_angle_d3d EGL_ANGLE_device_creation EGL_ANGLE_device_creation_d3d11 EGL_ANGLE_experimental_present_path EGL_KHR_client_get_all_proc_addresses EGL_KHR_debug EGL_ANGLE_explicit_context
WebGL 2 Driver Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics 4600 Direct3D11 vs_5_0 ps_5_0)
WebGL 2 Driver Version: OpenGL ES 3.0 (ANGLE 2.1.0.b0a9c45400d2)
WebGL 2 Driver Extensions: GL_ANGLE_client_arrays GL_ANGLE_copy_texture_3d GL_ANGLE_depth_texture GL_ANGLE_explicit_context GL_ANGLE_explicit_context_gles1 GL_ANGLE_framebuffer_blit GL_ANGLE_framebuffer_multisample GL_ANGLE_instanced_arrays GL_ANGLE_lossy_etc_decode GL_ANGLE_memory_size GL_ANGLE_multi_draw GL_ANGLE_multiview_multisample GL_ANGLE_pack_reverse_row_order GL_ANGLE_program_cache_control GL_ANGLE_provoking_vertex GL_ANGLE_request_extension GL_ANGLE_robust_client_memory GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 GL_ANGLE_texture_multisample GL_ANGLE_texture_usage GL_ANGLE_translated_shader_source GL_CHROMIUM_bind_generates_resource GL_CHROMIUM_bind_uniform_location GL_CHROMIUM_color_buffer_float_rgb GL_CHROMIUM_color_buffer_float_rgba GL_CHROMIUM_copy_compressed_texture GL_CHROMIUM_copy_texture GL_CHROMIUM_sync_query GL_EXT_blend_func_extended GL_EXT_blend_minmax GL_EXT_color_buffer_float GL_EXT_color_buffer_half_float GL_EXT_debug_marker GL_EXT_discard_framebuffer GL_EXT_disjoint_timer_query GL_EXT_draw_buffers GL_EXT_float_blend GL_EXT_frag_depth GL_EXT_instanced_arrays GL_EXT_map_buffer_range GL_EXT_occlusion_query_boolean GL_EXT_read_format_bgra GL_EXT_robustness GL_EXT_sRGB GL_EXT_shader_texture_lod GL_EXT_texture_compression_bptc GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_s3tc_srgb GL_EXT_texture_filter_anisotropic GL_EXT_texture_format_BGRA8888 GL_EXT_texture_norm16 GL_EXT_texture_rg GL_EXT_texture_storage GL_EXT_unpack_subimage GL_KHR_debug GL_KHR_parallel_shader_compile GL_KHR_robust_buffer_access_behavior GL_NV_EGL_stream_consumer_external GL_NV_fence GL_NV_pack_subimage GL_NV_pixel_buffer_object GL_OES_EGL_image GL_OES_EGL_image_external GL_OES_EGL_image_external_essl3 GL_OES_compressed_ETC1_RGB8_texture GL_OES_depth32 GL_OES_element_index_uint GL_OES_get_program_binary GL_OES_mapbuffer GL_OES_packed_depth_stencil GL_OES_rgb8_rgba8 GL_OES_standard_derivatives GL_OES_surfaceless_context GL_OES_texture_border_clamp GL_OES_texture_float GL_OES_texture_float_linear GL_OES_texture_half_float GL_OES_texture_half_float_linear GL_OES_texture_npot GL_OES_vertex_array_object GL_OVR_multiview2 OES_compressed_EAC_R11_signed_texture OES_compressed_EAC_R11_unsigned_texture OES_compressed_EAC_RG11_signed_texture OES_compressed_EAC_RG11_unsigned_texture OES_compressed_ETC2_RGB8_texture OES_compressed_ETC2_RGBA8_texture OES_compressed_ETC2_punchthroughA_RGBA8_texture OES_compressed_ETC2_punchthroughA_sRGB8_alpha_texture OES_compressed_ETC2_sRGB8_alpha8_texture OES_compressed_ETC2_sRGB8_texture
WebGL 2 Extensions: EXT_color_buffer_float EXT_disjoint_timer_query EXT_float_blend EXT_texture_compression_bptc EXT_texture_filter_anisotropic OES_texture_float_linear WEBGL_compressed_texture_s3tc WEBGL_compressed_texture_s3tc_srgb WEBGL_debug_renderer_info WEBGL_debug_shaders WEBGL_lose_context
Direct2D: true
Uses Tiling (Content): true
Off Main Thread Painting Enabled: true
Off Main Thread Painting Worker Count: 3
Target Frame Rate: 60
DirectWrite: true (10.0.17763.557)
GPU #1
Active: Yes
Description: Intel(R) HD Graphics 4600
Vendor ID: 0x8086
Device ID: 0x0412
Driver Version: 20.19.15.4835
Driver Date: 10-16-2017
Drivers: igdumdim64 igd10iumd64 igd10iumd64 igd12umd64 igdumdim32 igd10iumd32 igd10iumd32 igd12umd32
Subsys ID: 78231462
RAM: Unknown

Diagnostics
AzureCanvasBackend: direct2d 1.1
AzureCanvasBackend (UI Process): skia
AzureContentBackend: skia
AzureContentBackend (UI Process): skia
AzureFallbackCanvasBackend (UI Process): none
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GPUProcessPid: 3272
GPUProcess: Terminate GPU Process
Device Reset: Trigger Device Reset
ClearType Parameters: Gamma: 1.8 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 50
Decision Log
WEBRENDER:
opt-in by default: WebRender is an opt-in feature
available by user: Qualified enabled by pref

Media

Audio Backend: wasapi
Max Channels: 2
Preferred Sample Rate: 48000
Output Devices
Name: Group
Realtek Digital Output (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0892&SUBSYS_1462D823&REV_1003\4&2aae7760&0&0001
LP2361 (Intel(R) Display Audio): HDAUDIO\FUNC_01&VEN_8086&DEV_2807&SUBSYS_80860101&REV_1000\4&318d32db&0&0001
Speakers (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0892&SUBSYS_1462D823&REV_1003\4&2aae7760&0&0001
IP2362 (Intel(R) Display Audio):
ASUS VS228 (Intel(R) Display Audio): HDAUDIO\FUNC_01&VEN_8086&DEV_2807&SUBSYS_80860101&REV_1000\4&318d32db&0&0001
HP w2338h (Intel(R) Display Audio): HDAUDIO\FUNC_01&VEN_8086&DEV_2807&SUBSYS_80860101&REV_1000\4&318d32db&0&0001
Input Devices
Name: Group
Rear (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0892&SUBSYS_1462D823&REV_1003\4&2aae7760&0&0001
Front Pink In (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0892&SUBSYS_1462D823&REV_1003\4&2aae7760&0&0001
Front (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0892&SUBSYS_1462D823&REV_1003\4&2aae7760&0&0001
Rear Orange In (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0892&SUBSYS_1462D823&REV_1003\4&2aae7760&0&0001
Side (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0892&SUBSYS_1462D823&REV_1003\4&2aae7760&0&0001
Stereo Mix (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0892&SUBSYS_1462D823&REV_1003\4&2aae7760&0&0001
Front Green In (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0892&SUBSYS_1462D823&REV_1003\4&2aae7760&0&0001
Rear Black In (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0892&SUBSYS_1462D823&REV_1003\4&2aae7760&0&0001
Rear Pink In (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0892&SUBSYS_1462D823&REV_1003\4&2aae7760&0&0001
Center (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0892&SUBSYS_1462D823&REV_1003\4&2aae7760&0&0001
Rear Blue In (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0892&SUBSYS_1462D823&REV_1003\4&2aae7760&0&0001
Line In (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0892&SUBSYS_1462D823&REV_1003\4&2aae7760&0&0001
Rear Green In (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0892&SUBSYS_1462D823&REV_1003\4&2aae7760&0&0001
Microphone (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0892&SUBSYS_1462D823&REV_1003\4&2aae7760&0&0001
Subwoofer (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0892&SUBSYS_1462D823&REV_1003\4&2aae7760&0&0001
Rear Grey In (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0892&SUBSYS_1462D823&REV_1003\4&2aae7760&0&0001

Important Modified Preferences

accessibility.typeaheadfind.flashBar: 0
browser.cache.disk.amount_written: 782169
browser.cache.disk.capacity: 1048576
browser.cache.disk.filesystem_reported: 1
browser.cache.disk.hashstats_reported: 1
browser.cache.disk.telemetry_report_ID: 16
browser.search.update: false
browser.sessionstore.upgradeBackup.latestBuildID: 20190629100032
browser.startup.homepage_override.buildID: 20190629100032
browser.startup.homepage_override.mstone: 69.0a1
browser.tabs.crashReporting.includeURL: true
browser.urlbar.maxRichResults: 12
browser.urlbar.placeholderName: Google
dom.disable_open_during_load: false
dom.forms.autocomplete.formautofill: true
dom.push.userAgentID: 1bc4890a7e434886a94653dc504500c8
extensions.lastAppVersion: 69.0a1
gfx.crash-guard.status.wmfvpxvideo: 2
gfx.crash-guard.wmfvpxvideo.appVersion: 69.0a1
gfx.crash-guard.wmfvpxvideo.deviceID: 0x0412
gfx.crash-guard.wmfvpxvideo.driverVersion: 20.19.15.4835
idle.lastDailyNotification: 1561767401
layers.mlgpu.sanity-test-failed: false
media.gmp-gmpopenh264.abi: x86_64-msvc-x64
media.gmp-gmpopenh264.lastUpdate: 1559755943
media.gmp-gmpopenh264.version: 1.8.1
media.gmp-manager.buildID: 20190629100032
media.gmp-manager.lastCheck: 1561814182
media.gmp-widevinecdm.abi: x86_64-msvc-x64
media.gmp-widevinecdm.lastUpdate: 1561608505
media.gmp-widevinecdm.version: 4.10.1440.18
media.gmp.storage.version.observed: 1
media.hardware-video-decoding.failed: false
network.predictor.cleaned-up: true
places.database.lastMaintenance: 1561767403
places.history.expiration.transient_current_max_pages: 140686
plugin.disable_full_page_plugin_for_types: application/pdf
privacy.sanitize.pending: [{"id":"newtab-container","itemsToClear":[],"options":{}}]
security.remote_settings.intermediates.checked: 1560102620
security.sandbox.content.tempDirSuffix: {c92b73e3-de58-47e4-a4b7-37dc668c1aac}
security.sandbox.plugin.tempDirSuffix: {8ab910a5-8f70-4f1e-9424-8a622a83bc1e}
services.sync.declinedEngines: addons
services.sync.engine.addons: false
services.sync.engine.addresses: true
services.sync.engine.addresses.available: true
services.sync.engine.bookmarks.validation.lastTime: 1561786387
services.sync.engine.passwords.validation.lastTime: 1561786387
services.sync.engine.prefs.modified: false
services.sync.lastPing: 1561786385
services.sync.lastSync: Sat Jun 29 2019 12:33:36 GMT-0600 (Mountain Daylight Time)
signon.importedFromSqlite: true
storage.vacuum.last.index: 1
storage.vacuum.last.places.sqlite: 1559758441
ui.osk.debug.keyboardDisplayReason: IKPOS: Touch screen not found.

Important Locked Preferences

Places Database

JavaScript

Incremental GC: true

Accessibility

Activated: false
Prevent Accessibility: 0
Accessible Handler Used: true
Accessibility Instantiator:

Library Versions

NSPR
Expected minimum version: 4.21
Version in use: 4.21

NSS
Expected minimum version: 3.45 Beta
Version in use: 3.45 Beta

NSSSMIME
Expected minimum version: 3.45 Beta
Version in use: 3.45 Beta

NSSSSL
Expected minimum version: 3.45 Beta
Version in use: 3.45 Beta

NSSUTIL
Expected minimum version: 3.45 Beta
Version in use: 3.45 Beta

Sandbox

Content Process Sandbox Level: 5
Effective Content Process Sandbox Level: 5

Internationalization & Localization

Application Settings
Requested Locales: ["en-US"]
Available Locales: ["en-US"]
App Locales: ["en-US"]
Regional Preferences: ["en-US"]
Default Locale: "en-US"
Operating System
System Locales: ["en-US"]
Regional Preferences: ["en-US"]

Actual results:

Portion of the screen is painted with a black background

Expected results:

The screen should paint correctly

Comment 1

[Ronald Tilby]

I no longer see this problem on my machine using the 2 July 2019 nightly.