unclickable area (nVidia)

[Dj YB]

Hello,

I am experiencing for some time now a very odd thing, probably related to the 
nVidia driver but wanted to see if anyone else got the problem.
almost als over a horizontal line on the screen I can not click, no matter 
what window is in focus...
really strange.

using F15, 
compiz-0.9.4-2.fc15.i686
kmod-nvidia-173xx-2.6.38.8-32.fc15.i686.PAE-173.14.30-1.fc15.4.i686

if anyone else seeing this, please tell me.
Thanks,
YB.