I'm getting this bizarre glitch from Compiz in Ubuntu 8.10 intrepid. It renders a small gray dot wit a fading halo around it on the same place on any window I open. At first I thought it was my monitor, but when i took a screen shot it showed up on the image. So I tried turning Compiz off, and it went away. When I turn Compiz back on, it's there again.

I've tried turning off all of the different effects in compiz one by one to see if any one effect is responsible, but this doesn't seem to work. I've searched the web and found only one other person with this glitch, and they had no solutions for the problem. I am running my system witha an ATI 1650x GPU and have plenty of ram. Again I know for a fact it is not hardware related because it goes away when i turn compiz off. I am including a screen shot so you can see what looks like. It's really weird.

Another weird aspect is that when I scroll my mouse cursor over it, it goes under the cursor, and when i use the zoom function via <super>+ <mouse scroll wheel> it continues to draw it on the same place on the window, and even magnifies it as though it's part of the window. Again I've unchecked all of the compiz options so it's not burn or water effect.

Any ideas?

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what type of video driver you are using e.g VESA/GEODE/else ?
And check your xorg.conf file they match.

Upgrading to Jaunty Jackalope seems to have fixed it, though now I'm having tons of problems with x crashing for no clear reason. I filed a bug with the Ubuntu team, but did a lame job of it, and am trying to clean up my launch pad post a bit. Basically X keeps crashing when ever my computer is idle for periods ranging from 3-40minutes. I turned everything off, the screen saver, compiz, display sleep options, everything, and it just keeps happening.

I had problems with the open source xorg-ati driver in the past and was using the proprietary driver, but ATI stopped supporting my card, even though it's only three years old (never buying anything from them ever again). I'm really irritated at this point as everything was working well (minus the grey spot with compiz glitch) in intrepid and I was really stoked by how good the Ati driver support was getting in Ubuntu, but now my computer is basically useless until I downgrade back to intrepid.
This is a huge pain in the ass, as i use this computer to do my school work and run my business, and i have to do many hours of file transfer and software instillation. To be fair they did issue a warning saying the new version of x no longer supported my cards older proprietary driver, but i wish i would have had a better idea of what was going on before i made the decision to do the upgrade via update manager. Oh well, I guess I'll just have to stick with intrepid, till i can afford to buy an nvidia card.