Thanks for your answer. Problem is the model can not rotate a little bit, it rotates 30 degrees etc but I need to rotate 12 degrees (for example) And center pivot of the model locates irrelevant location. So, I can not rotate sensitively.
I have installed latest release a few days ago. I have not encountered a situation like this before. I don't know, Is this the reason could be? Do you have tried to test latest release?