Created attachment 491406 [details] Screen shot See the attachment. The same thing happens in the cascading menus in the first column of the Firefox menu, but it doesn't happen for the cascading menus in the second column. This has been happening for a couple of weeks on my machine (Lenovo T510 w/ NVIDIA NVS 3100M (driver version 18.104.22.16838). Setting gfx.direct2d.disabled = true works around the problem. FWIW, the graphics driver on this machine resets regularly.
If you are in 650 Castro you can see this first hand (3rd floor, seat #D-127).
Could you post the info from about:support here?
Application Basics Name Firefox Version 4.0b8pre User Agent Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b8pre) Gecko/20101118 Firefox/4.0b8pre Profile Directory Open Containing Folder Enabled Plugins about:plugins Build Configuration about:buildconfig Extensions Name Version Enabled ID Universal Behavioral Advertising Opt-out 0.2 true email@example.com Modified Preferences Name Value accessibility.typeaheadfind.flashBar 0 browser.places.smartBookmarksVersion 2 browser.startup.homepage http://www.google.com/ browser.startup.homepage_override.buildID 20101118063753 browser.startup.homepage_override.mstone rv:2.0b8pre extensions.lastAppVersion 4.0b8pre gfx.font_rendering.cleartype.use_for_downloadable_fonts false network.cookie.prefsMigrated true places.history.expiration.transient_current_max_pages 124434 privacy.sanitize.migrateFx3Prefs true security.warn_viewing_mixed false Graphics Adapter Description NVIDIA NVS 3100M Vendor ID 10de Device ID 0a6c Adapter RAM 512 Adapter Drivers nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um Driver Version 22.214.171.12438 Driver Date 6-27-2010 Direct2D Enabled true DirectWrite Enabled true GPU Accelerated Windows 1/1 Direct3D 10
Created attachment 493281 [details] Just another image of the same problem I'm also seeing this. Easy to reproduce - but no concrete steps. Opening a second window and right-clicking in a few places is fairly likely to cause it for me. Occasionally I've seen the main Firefox menu do this as well. Version: 4.0b7 about:support / Graphics... Adapter Description: NVIDIA GeForce GTX 260 Vendor ID: 10de Device ID: 05e2 Adapter RAM: 896 Adapter Drivers: nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um Driver Version: 126.96.36.19945 Driver Date: 4-3-2010 Direct2D Enabled: true DirectWrite Enabled: true GPU Accelerated Windows: 3/3 Direct3D 10
Seems like Dupe of Bug 613790, no?
(In reply to comment #5) > Seems like Dupe of Bug 613790, no? Does to me. I also verified this issue is fixed for me in nightly build 2010-Dec-22.
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