I'm getting the glitch a lot more, but trying to remember what sets it off
most:

1. Youtube. Often, but not as often as #2.

2. Clicking on an element that brings up another element onto the page,
basically over it with a higher z-index, like I said facebook does this a LOT.

3. Adding elements to the page at all can also trigger this bug. Like loading
ANY comments, from disqus to yahoo, they all have triggered it.

4. Slideshows where the objects slide against each other, like in PCWorld
slideshows, just had a crash there.

All of these have in common is moving pixels, but also adding pixels to the
screen. Is there special code for that, those dirty rectangles being glitchy or
something? I have, well, only bare minimal knowledge of how these drivers work
from looking at lots of Git commits, but I bet that is a pretty good clue to
people who know what they're looking at with what could be wrong. :)