Originally Posted by purinkle
I now have the problem that when I click on the "Start Menu" and hover over a sub-menu if the sub-menu contains more than x items they are not visible unless I scroll over them.
Not sure exactly what you mean by this. Are you saying you have sub-menus that have more items then your screen resolution will vertically allow for, and in order to view the ones at the bottom, you need to scroll to them? If so, this is normal.
However, it does sound like you're having some redrawing issues. Which desktop enviroment/window manager are you running (gnome, kde, etc)? Have you tried simply restarting X (CTRL+ALT+Backspace)? How long has this been going on?