I filed a bug report for a regression I have
http://bugs.gentoo.org/show_bug.cgi?id=265092
but it's kind of hard to get support when you use an proprietary driver.

The Problem is I have 2 ati graphic cards (one on board). 3 Monitors.
It worked fine with xserver <1.5 but now the bigger monitor somehow sends the resolution of the smaler monitors to the windowmanager, when the wm askes fot the maximum screensize.
see http://bugs.gentoo.org/attachment.cgi?id=187448 scroll to the bottom right and you see what I mean.

I know it's not gnome, because the only thing I updated was the xserver.
So I'm here, hoping that someone knows which api changed, and who isn't using it correctly. (or fixes my bug)