Random Pixelated Boxes

I've seen posts describing a similar problem to mine, but never quite the same, so I’ll give a description a try. I've got a G4 iMac flat panel running 10.4.4.
Here's the problem: Every now and then, regardless of the program running, I get these square boxes (about 2in x 2in) that pop up randomly on the screen. They are boxes of random pixels that seem to somehow reflect what is on the screen (colors change as I scroll), but I cannot see what is under them. I can still access any links beneath them, but I cannot see what the link is because the box covers it.
It first happened when I updated to 10.4.3. It was so bad that I decided to go back to 10.4 and just wait for the next update. There was no problem when I went back to 10.4.0 (or 4.1 or whatever). When 10.4.4 came along, I installed and had the same problem. So I tried changing mice (it seemed to be related to scrolling). At the time I was using a Kensington Iridio. Switching back to the pro mouse that came with the iMac seemed to solve the problem. But there's no scroll wheel, so I decided to get the Mighty Mouse. Well, now I’ve got the problem all over again.
I've tried disk First Aid, defragging, restarting--nothing has worked.
So, to sum up: square boxes of pixels seem to pop up randomly; they are not specific to any program (Safari, Firefox, PDFs, iTunes, etc.); they seem to be related to scrolling, although maybe not; if I restart the program after it happens, they boxes are gone; it does not seem to be related to how long the computer has been on. Also, I’ve got a screen shot of it, but I don’t think I can attach it here.
Any ideas? Should I just go back to 10.4.earlierthan3 and call it a day?
iMac G4 flat panel Mac OS X (10.4.4)

Update: I went back to the original pro mouse and it is still happening.
Tired. So very tired.

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