Loud beep when selecting from pop-up menus
FileMaker version: Pro 8.5v2
Operating system: Windows Vista
Since a week or so I am frightened by a very loud beep every time a choose an item from a pop-up menu. It sounds as if I am doing something seriously wrong, but the program works correctly. I turned of all Windows sounds, but the beep continues. I reinstalled the program and its v2 update, but this doesn not change anything. As far as I know, I didn't change much to my documents neither. The beep was there suddenly and unexpected.
What might be wrong that was still right a week ago?