Window decorations gone
 

I hope anyone can help me with this annoying problem. When I turned on my computer this morning and started KDE the window decorations were gone. That is, no buttons, no borders and so on. Just the content that is in the window is visible. So I tried another window manager (fvwm i think). Same thing there. No windows, just the content. So i tried rebootng the computer with an old kernel, and that helped. Things were back to normal. So my question is. Is there anything to do other than to recompile the kernel?

Could it maybe be the driver for the graphic card? It's an Nvidia 2 Go.

/Andreas