Do you tried CTRL+ALT+F1 to switch to console and CTRL+ALT+F7 to switch back?
After that my Dell Inspiron 9600 + Nvidia + desktop effects worked again.
It seems to be a problem with the nvidia driver + desktop effects.
It appears every time I use a "Fn + some_fn_key" on my laptop like increase or 
decrease sound volume.

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Mouse has suddenly no contact, till X-Server restart
https://bugs.launchpad.net/bugs/324506
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