I'm using xorg-server-1.0.99.901-r1 and xf86-video-ati-6.6.0. After I upgraded from xorg-server-1.0.2-r3 and xf86-video-ati-6.5.7.3, I started having this problem. When I play a flash video, the video itself as well as the screen areas to the sides of it get corrupted. I will attach screenshots.
Created attachment 85699 [details] Screenshot 1
Created attachment 85700 [details] Screenshot 2
Give xorg-server 1.0.99.902 a try, and re-open this bug once you've done so.
Tried it... Still the same behavior, unfortunately.
Do you have EXA enabled? If so, try disabling it. If that doesn't fix it, can you reproduce this with the VESA driver?
Yep - when I disabled EXA, the bug disappeared.
Alright, please report this on https://bugs.freedesktop.org and post the resulting URL here. Thanks!