Version: (using KDE 4.0.3) Installed from: Fedora RPMs I started to add effects to kwin via systemsetting and on accepting, X tried to restart but went back to the login screen. After going down to run level 3 and running startx manually, I found out that the problem lies somewhere in the kwinrc file (after renaming it, X starts OK). I will attached the standard error output of a failed startx session and the offending kwinrc file.
Created attachment 24807 [details] standard error output of startx (w/o kdirwatch messages) Error output
Created attachment 24808 [details] offending kwinrc file offending kwinrc as discussed.
Created attachment 24809 [details] xorg.conf xorg.conf
Going by the backtrace in the first attachment it looks to entirely be an X+driver issue. Does it still occur in the latest version of KDE?
Marking as a duplicate of bug 174769 as it will fix the login problem. The crash is X itself. *** This bug has been marked as a duplicate of bug 174769 ***