logout works weird

Fine tuning is a nice work but sometimes you are left with weird behavior. If I logout of my KDE since today I have to click two times on the logout button. The first time some programs stop but my KDE desktop is still there and intact. At the second time clicking I may logout. The fact that I get also a screen saver although I have unchecked the check box may be connected to this phenomena. Is it possible to have two sets of desktops. Know in the meantime that that may be possible with KDE/Gnome. Other possibilities? Solution?