This sounds like a computer performance problem. You're running at 1.60 GHz which is under our recommended 2.0Ghz. Not to mention, if you have other programs running (even background programs which most computers do) that can also slow overall computer performance. As a result, CB is having trouble fully completing an action you try to initiate like optimizing, updating, exiting, etc. - you will likely hit 'not responding' states that could take longer than normal to finish through (or not finish).
Did you access to a computer with better specs?