Version: 4.2.91 (using KDE 4.2.90)
Installed from: SuSE RPMs
There is a problem to switch to new sessions if they have different type of session (KDE, Gnome).
mail thread - http://osdir.com/ml/fedora-list/2009-06/msg03544.html
reported Gnome bug - http://bugzilla.gnome.org/show_bug.cgi?id=568540
slightly different problem, but with the same root cause, which will likely be fixed at the same time.
*** This bug has been marked as a duplicate of bug 186198 ***