hi guys im new here so i cant find this problem in here. I have a macbook pro 15" 4GB RAM 512mb graphic card and 2.3 ghz turboboost 3.3. so i ve only wow in macbook for game and autocad 2013 vs. i ve 420 gb free space. 2 days ago when i opened my mac its upper side bar is hiding then when my cursor goes there it shows but its freezely coming from up. mac runs so well but this is crazy. i restorre my mac than this bug fixed. (i restored yesterday and look this bug yesterday it fixed) but this morning i opened mac and issue came again. please help me what is happening?