Fedora "auto logging-out" after updates?

[Gustavo Seabra]

Hi,

After my last updates I noticed that, after leaving the computer 
incative for some time, when I come back I get the login screen again. 
I'm not sure wheter it logged out or the X crashed (how can I find 
out?). Does anyone knows what is causing this behaviour? I'm using KDE 
and the KDE login manager.

This is the end from /var/log/yum.log (it started after these updates):
(...)
Dec 14 16:42:19 Updated: gstreamer.i386 0.8.7-4.FC3.0
Dec 14 16:42:26 Updated: arts.i386 8:1.3.2-1.0.3.kde
Dec 14 16:42:27 Updated: pth.i386 2.0.2-0.fdr.2.3
Dec 14 16:42:28 Updated: mikmod.i386 3.1.6-30.2
Dec 14 16:42:30 Updated: selinux-policy-targeted.noarch 1.17.30-2.51
Dec 14 16:42:31 Updated: grep.i386 2.5.1-31.2

Thanks,
-- 
------------------------------------------------------------------------
*Gustavo Seabra*
<http://www.ksu.edu/chem/personnel/faculty/grad/jvo/ortiz/people_seabra.html>
- Graduate Student
E-Mail: seabra at ksu.edu <mailto:seabra at ksu.edu>
Phone: (785) 532-6072 Chemistry Department <http://www.ksu.edu/chem/>
Kansas State University <http://www.ksu.edu>
Manhattan, KS 66506-3701