Sometimes the scrollbars are missing the bitmap elements (arrows, hash marks in the middle). Theme, safe mode, and new profile all have no effect.
After this was filed I restarted 2.3.3, which is the first version I experienced this bug in, but before doing so, I looked for *.mfl to delete from my profile, and there were none. So instead I deleted startupCache.4.little, then started, and the bitmaps were missing no more. The freshly created startupCache.4.little file is 677,926 bytes, while the 28 hour older one I deleted was 772,807. How many tabs I had open then and now I have no idea, as I keep open too many to keep track of.
First 2.5 start they were missing again. I immediately shut down, deleted startupCache.4.little, restarted, and normal was restored. startupCache.4.little is currently 1,667,392 bytes while 2nd startup remains active, with 26 tabs, plus a mailnews window. I only ever use Modern theme. Original profile create date is 5 days short of 2 years. I use a userChrome.css file that is 3.621 bytes, eCS 1.14, latest Snap, SDDFONTSIZE=medium, SDDICONS=small, with Innotek FE 2.6beta applied to pmshell.exe, but no other apps I currently use. 12 *cache* about:config entries are not at defaults. Installed extensions are Addon Compatibility Reporter, Chatzilla, Copy Plain Text, DOMI, JS Debugger, NoScript, Preserve Download Modification Timestamp, SQLite Manager.
Apparently this is not necessarily limited to OS/2. With Modern theme'd 20110928 2.4.1 Linux last open in KDE 3.5.10 before replacing it with 2.5 it happened to me, but it fixed itself on first 2.5 open.
Component: Widget: OS/2 → Widget
OS: OS/2 → All
Summary: [OS/2] bitmaps for scrollbars sometimes missing / not drawn → bitmaps for scrollbars sometimes missing / not drawn
First 2.6 start they were missing again. I immediately shut down, deleted startupCache.4.little, restarted, and normal was restored.
In comment 4 I meant to say in Linux, where the same thing happened again with 2.7.
Whereas this was intermittent for me in previous builds, it is consistent with 2.7 default theme (on OS/2). Deleting startupCache.4.little has no effect (button images still missing). I haven't run on Linux often enough to notice a pattern, though I'm sure I've seen it at least once. I'll will spend some time with a fresh profile to see if I can detect anything odd with my usual profile.
Happened to me again in rv10.0.6 build ID 20120801231937 on eCS.
I have some consistency to this, I think. I'm presently running SM 126.96.36.199/ESR. Normally, I start the app by launching MailNews. In this manner, I consistently have scrollbar bitmaps. However, if I launch the browser first (typically, I restore a dozen or so tabs when the browser window opens), or if I install an extension and then restart (which by default starts the browser first), scrollabr bitmaps are *consistently* missing. It feels like a shortage of some memory resource at launch time, where the greater demand of drawing the browser windows (perhaps) as opposed to starting a single tab in MailNews makes the difference.
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