I would rest back to default. Control_Q is a system assigned key for full rebuild, don't over write to something else!!!!!
Have you shut down and restart your SW? if you have and the arrow button no long rotates the model reset to default.
you know you can hold down the wheel on your mouse to rotate your model??
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Thanks for the suggestion, but it does not help. Someone else also told me that he has the same problem and cannot solve it. Maybe it is just a SW bug.
I do know about the mouse wheel, but I like the arrow keys better as the rotation is in finite steps.