I have encountered pretty bad one: right after a correct login, when KDE desktop starts up, it throws me back to the login screen. I can login as root though, and get fresh, new defaul-set desktop for the superuser, so it definitely must be up to certain configurations.
It began shortly after the update from KDE 4.1.3 to 4.2
I got this same problem after updating from 4.2.1 to 4.2.2. I tried the proposed rm and no joy. The interesting part about this little update is that I didn’t even have the graphical login prompt installed on 4.2.1. It was an automatic login. After the update, I now have the graphical login that is never ending. :’( This is third time I installed SUSE11.1, after looonnnngggg hours of updating. At the same time I have been doing the setup to another computer I have. It is also interesting that no matter how hard I tried to keep the two the same, they are different, especially now. I have one that has never ending login but has been able to install some development tools on it, while the other computer doesn’t have the graphical login but I can not get the same development tools installed on it. rotfl!