I have just installed Fedora 12, and while everything in GNOME seems fine, I am receiving a number of graphical glitches in KDE4. This is with the standard install (i.e no experimental drivers).
For example, entries in the application menu seem to have a blue-tint, and sometimes a garish orange highlight happens during mouse over. Window widgets also do odd colourization things, lick the (x) button going red.
I am using the radeon driver at the moment. I tried radeonhd but I cannot get that to work.
Does anyone have any suggestions?