Unity launcher doesn't show all the applications when I put the cursor on it (Ubuntu Quantal)

view story

http://askubuntu.com – When I put the cursor on Unity launcher (I'm using Ubuntu 12.10) to see all the applications, it doesn't move in a vertical way but it remains immovable. The launcher works only if put the cursor on the center of the icon application, but if move the cursor on the left screen it doesn't work well. To be honest, I've added some compiz effects to Ubuntu(like cube, shaking windows, animations, etc) and, if i'm not wrong, this issue has begun from then on, but I've done the same things on Ubuntu 12.04 and I never had this problem... Am I forced to reset unity maybe? Here you are a screenshot which (HowTos)