Version: 4.3.4 (using KDE 4.3.4) OS: Linux Installed from: Ubuntu Packages Use a window decoration with rounded corners, such as Oxygen. Suspend compositing. Resume Compositing. Notice the square corners. In Konsole, run 'xrefresh' to get rounded corners back. I imagine that resuming compositing should automatically run the equivalent of an xrefresh to make sure things are redrawn properly after a resume.
As far as I can tell, this is fixed in kde4.4.
Great. I can't wait until next month. (I never understood why these things aren't patched in the current stable version.)
After updating to KDE 4.3.5 this problem is no longer present.