Hello,
It is possible that you have a permissions problem, a profile problem, or perhaps you have too many things in the task bar.
Create a different account under OSX, and login. Set the magnification and behavior just like you did on the first account. See if the new account has the same problem or not.
If the problem goes away, you have a profile issue with the first account. If the problem is still present, then it is a deeper issue.
Hope that helps,
Christian
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