I've had similar problems, and I eventually apparently fixed it. I'm not sure which of these two things fixed it though: 1) I uninstalled xfs-xtt, and installed xfstt. 2) My harddrive was almost full, so I deleted some stuff and cleared up space. Background: I noticed in the file ~/.kde3-errors, the only error was some problem with initializing TrueType fonts, hence possible fix 1. Second, I'm sure it makes a difference that the harddrive was near capacity. By the way, if that doesn't work, some other forums for kindof similar problems suggested deleting /tmp/*, ~/.Xauthority, ~/.ICE-authority, and if you want to get really drastic, ~/.kde.
Speicifically, I got this error in ~/.kde3-errors:
$ xset +fp /usr/share/fonts
xset: bad font path element (#64), possible causes are:
Directory does not exist or has wrong permissions
Directory missing fonts.dir
Incorrect font server address or syntax
Note that there is a thread on that error here:
http://linuxquestions.org/questions/...ath+element+64