KDE not running in Fedora 11
 

When I log in I get this message:
"Could not start kdeinit4. Check your installation."
in what looks like TWM, and when I click Okay, I'm logged out.

Most worryingly, this happened WITHOUT ME DOING ANYTHING!!

Somebody had the same problem and solved it. Just google "kdeinit4 cannot start" and you will find the solution.

try:
chmod 777 -R ~/{.kde,.kde4}
kwin & plasma-desktop

in the recovery mode (with only a shell)