I have a very strange issue. Whenever I select something (using either the direct selection tool or the normal selection tool), I can't do anything without moving the selected items. So for example I select something (by clicking 1 time on it with my left mouse button) and then I want to move my mouse to do something else (select another tool, select something else, whatever). When I move the mouse the object (shape?) selected will move there (after a small delay). So the object will end up where my mouse was, let's say, half a second after i started moving the mouse. This makes working with Illustrator nearly impossible as you need to cmd+z everytime you select something. Right clicking also does not work for me if I hold my mouse still at the place where I selected the object, the only option I seem to have to continue is to move my mouse, which you of course would usually want to do.
I have reinstalled Illustrator already, manually deleted the folder ~/Library/Preferences/Adobe Illustrator CS6 Settings/ , and I have tried it with another mouse. None of it solved the problem. Photoshop works well. I have compared the behavior with Illustrator on another computer and it is definitely not correct.
I am using Illustrator 16.0.4 (CS6) on OS X 10.8.3. As far as I know, I have no 3rd party plug ins. I couldn't find anything about other people with similar problems.
Anyone a clue? Or else I am afraid I need to reinstall my whole Mac with a fresh OS and all...
I tried using the Guest Account on my Mac. In the Guest Account, Illustrator works perfect!
Then I started wondering what processes (tools/tweaks) I run by default on my account. Turned out the problem was called by a little background tool called RightZoom. RightZoom let's the green 'zoom' button always maximize your current window.
So thanks! Problem solved!