Did you just upgrade to selinux?
I had updated directly from a Fedora 10 Preview LiveCD to Rawhide,
manually working around the RPM, Python 2.6 and OpenSSL issues.
Try
yum reinstall selinux-policy-targeted
So now my frozen GDM is replace by a blank black screen. :-) However I
can now Ctrl+Alt+F2 to a virtual terminal and log into text mode,
which was earlier not possible with the frozen GDM. From there on
startx provides me with a desktop, but the mouse does not respond and
the pointer is the ugly black X one.
There is a bug upgrading from F10 to F11 that is causing stuff to
crash.
Should be fixed tonight.
Okay, I shall try again tomorrow.
Happy hacking,
Debarshi