Comment 6 for bug 499373

I marked it as such, because it is.

Thank you for showing your ignorance of how Compiz works. Sure, you are observing the problem in 2 different ways but it *is* the same problem.

Compiz is given (for each icon) a region. It uses that region for multiple things, among them it will show a preview if the mouse enters that region and it will also use that region as the target of the minimize animation.

Docky sometimes screws up maintaining that region for some icons. Thus you observe it (sometimes) in these 2 ways.