Auto Fill Freezes and Malfunctions

This is the 2nd or 3rd time I have asked up on this problem. No responses previously, although several others wrote to say that they are experiencing the same problem with Safari Auto Fill with Mountain Lion.

Here's problem: I have autofill set on Safari. As I start to type in a form, eg, name, address, email, the small auto fill pops up. I click on it. It turns color, from wihite to blue. And then does nothing more happens, no autofill, and worse, the autofill screen stays there, on top of the open page. On my screen, not the website page. If I close the page, the blue popup screen reamins. No matter which safari page I go to, the blue popup screen stays on top of the page, frozen in place. I can neither move nor close it. As a result have no benefit from autofill. So, I have no use of autofill. This problem started after I upgrade to Mountain Lion, on 2 computers, a MBA and an iMac. Same thing happens with Autofill on both computers.