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Hi Andrea,

Yes, there is such problem with AutoCAD and this problem occurs randomly on different hardware, maybe on Macs with Iris Pro graphics card it occurs more frequently.
The solution which worked for me (I also have seen such issue, but only a few times) is to launch AutoCAD and then quit it completely (means using menu AutoCAD -> Quit AutoCAD). The main idea is to ensure that AutoCAD quit without any crashes, so - don't open any existing drawings, just launch AutoCAD with new empty drawing and than quit AutoCAD.
From this point the glitches should go away, of course until something wrong happens when you will use AutoCAD in future - such as crash, but I have to say that not all crashes can case this issue to appear.

Maxim