You and Tom Kim both. And apparently, dozens more of Mac users. Some of the problems that Tom cited on his machine were some sort of static-looking borders around the popup menu, a weird color band that runs across the top of the desktop picture and degradation on the Dock bar.

There are a lot of theories circulating on why this could be happening for the Mac's screen. Rumors range from rendering of shadows to a problem with the video card to using secure virtual memory. But one point that they all agree on is that this happens when you're really taxing your system. The solutions are just as varied as the possible causes. Some suggest to disable the virtual memory or to install the latest firmware upgrade, claiming that this has done the job for them. Rumor has it that Apple is well aware of the problem and is working on a remedy that will be included in 10.4.8.