Comment 117 for bug 805303

This has re-emerged in the current state of 12.10, though in a more limited fashion.
(have nvidia card here

Seen clearly by opening vlc & going either
Media > open disc
or
Tools > Preferences > clicking on 'Show settings > all'
If it doesn't occur the 1st time, then repeat
Removing overlay-scrollbar* & this doesn't occur, or switching qt to another gui like cleanlooks, just like before
(if removing overlay-scrollbar* to test make sure all 3 packages are removed or you'll not be happy

May be best to wait for A1 to re-open or file new?