In KDE I like to run File Manager as SU (kdesu konqueror) sometimes. This has been fine for a while, adn always was fine in 8.0 The other day it just refused to run, and I don't know why. It gets as far as the password form, then just dies.
I had this problem in 8.0 with KDE 3.0.1. Evern upgrading to 3.0.2 didn't work. I think this is a result of you deleting *.* in /tmp and letting KDE recreate everything. I never figured out what was wrong. There was one day that I beat the crap out of my computer using apt. Lilo was screwed up and I didn't know what to do. So I reformatted my hard-drive and it fixed the issue. Never messed around with /tmp again. I didn't file a bug report at kde. I think there was a reply or two for it. YOu may wnat to check the replies out. Salman