Thanks for the responses. I just compiled Wine-1.0 and used it to run the Windows version of Firefox 3. The same "wandering window" issue exists on my machine. The issue seems to occur with many other apps too. By the way, I'm now using Xquartz 2.2.3 - (xorg-server 1.3.0-apple21) I'll hold off on the bug report, until someone else can confirm that there is a non-local problem.
