hello everyone. i try to put a better subject but really i don't know how say better...

well, first, my system:

Archlinux, KDE SC 4.3.4. Nvidia drivers: 195.22

when a work in my KDE after a indeterminate time, the windows of KDE and the all menu option (when i click with the right button mouse) that show in black.

I read the Xorg.0.log and don't show anything. When this pass, i loose every in my KDE, i don't see anything, if i click in the K menu, don't show nothig. If i run Alt + F2, nothing show, the same with Yakuake....

I wonder, what happen??

anybody help me?

Anything unusual in ~/.xsession-errors? Can you access the tty via Crtl+Alt+Fx?