Problem: maximizing windows moves them to bottom screen-edge (KDE4.x)

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I just restarted my notebook (after ~10 days uptime) and now everytime I try to maximize windows, they are moved to the bottom of the screen and they get cut off.Somehow it seems like my X,Y coordinates start at 800,0 (my resolution: 1920x1080).I checked already my screen-settings and tried to reset them, but it didn't work.Another thing: I usually use tilda as my on-screen terminal, which is usually located at the top left edge. now when I start it, it pops up on the bottom left, even tho in the settings it is on 0:0 position.Anyone here who knows what it can be and how to fix it?Thanks ()