All of a sudden FaceTime stopped working properly on my 2011 MBP (Core i5): I can see and hear my contacts, but they can't see or hear me. With Skype they can hear my voice and I can both see and hear them, but they can't see me. I tested the iSight camera with Photoboot and it works fine both for photos and videos. My firewall is off. Any ideas? Thanks in advance.