Hi All,
Scientific Linux 6.4, 64 bit. Xfce 4.8
As I am running several KDE apps. (Krusader, Kompozer, K3B), every so often after an update, I get booted up into KDE (sometimes GNOME). If happened again this morning. Pain in the neck.
As Red Hat is dragging the feet fixing the various GDM bugs that cause this, I have developed my own work around in the mean time. If you are having the same issue, I hope this helps you as well:
1) log out of KDE or GNOME desktop. If you are using Automatic log on, cancel it.
2) open an alternate command prompt and log in as root <cltr><alt><f2>
3) # cd /usr/share/xsessons
4) move or rename all desktops, except Xfce's. Note that KDE has two (kde-plasma.desktop kde-plasma-safe.desktop). You should look like this:
# ls gnome.desktop.orig kde-plasma.desktop.orig kde-plasma-safe.desktop.orig xfce.desktop
Note: I have been known to just delete the .desktops I don't want
5) # reboot
-T