Please provide more complete system specifications, as well as the previous functional driver version you were using.
Also, more people might jump in to help if you fixed your link. Right now it just jumps to the TinyPic homepage.
A quick search found some other people with this problem in SmallWorlds/MiniMundos. Suggestions include: try a different browser, ensure hardware acceleration is enabled for flash, reinstall flash, and reinstall graphics drivers. If you could try these things and report back, that would be great.
It should be noted, however, that this looks more like a MiniMundos problem than an AMD one. The artifacting is pretty limited there, which (to me) suggests that you're not dealing with overheating or lack of power.
I would try either disabling hardware acceleration in Opera, or using a different web browser such as Chrome.