white box when roll up window in 11.10

[drvista]

I have installed 11.10 and every thing is fine except
Gwibber is a bit buggy
when I roll up a window a white box is viewed how can i fix this ?
screenshots are attached
ps: tried to unity --reset and logout and re login but not fixed

update:
https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/882855