Hi, I had a question about cache in a mac. I hadn't cleared my cache in awhile and wanted to do so to speed things up and in trying to clear the cache by dragging it to the trash it says "Imagecapturenotificaton.devicediscoverydatabase.501 in use" and won't let me clear it. I've seen other threads where people had similar problems getting rid of it and they changed user names to remove it? What is this exactly? Is it a virus? How does one get this message in the first place? I've had my Imovie09 program crash a number of times. Could this be a cause? Thanks.