kwin --replace

Many users at work have been reporting problems with our new Red Hat Enterprise Linux 4 (RHEL4) installation when running KDE. The problem manifests itself when they cannot move or resize their windows in their current session. This makes the system very unusable. Luckily, the fix is very easy. Simply type "kwin --replace" into a terminal window in the session that's not responding. This has been effective in resolving this problem in most instances. If I understand correctly, what it does is replace the current window manager with a new instance of the kwin window manager that KDE uses. Hope this is helpful if you run into the same problems that we've had.