I have an Apple iBook G4 with Radeon Mobility 9200, with SuSE 10.0 ppc. I've tried
both the standard 6.8.2 xorg and RC3 of 6.9 (with EXA). Both randomly produce
yellow drop shadows with kompmgr for KDE. It is reproduceable with kmail opening
from the system tray. It also seems common with image viewing/editing apps, but it
does not seem to be consistent. See screenshot:
I've compiled the official release of 6.9, and all seems to be resolved. I have not
experienced the same problem again after several days.