I'm using Firefox 2.0.0.2 on OS X (10.4.8, PPC), and pictures have been rendering strangely for a while, probably for a month or two, I believe only since I switched to Firefox 2.0 (from the 1.5 version), though it didn't start right away.
Occasionally, pictures will be displayed in one of two crazy ways. The first way has part of the picture showing up fine, but it quickly descends into madness:
The second way makes large chunks of the picture rearrange like those infernal sliding square puzzles (this is two pictures, but they're both affected the same way):
Now, this doesn't happen all the time, far from it actually. But, it does seem to affect the same kinds of pictures time and time again; the buttons at the top of the PA forums in the first pic are often scrambled, just like the buttons at the top of digg.com, while avatar-size pictures are (usually) the only ones to be scrambled like the second pic. I have no idea what's causing this; I've tried connecting through both my wireless router and directly plugging my laptop into the jack (I'm at college), disabled and re-eneabled all my plugins, etc. Has anyone had trouble with this sort of thing before?
Edit: I've also tried clearing my cache, which sometimes fixes the old problems, but creates new ones. I guess that anything that's already been stored as broken will be wiped clean, but things that used to work then have a chance of breaking the next time they're loaded, so that really doesn't help me out too much.
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Did you try completely removing Firefox and starting fresh? Video drivers?