I've recently upgraded to Sierra and run versions 16A320 and a clean install of 16A323. Both versions I haven't been able to do FaceTime video calls. My setup is a Mac Pro with an external FW iSight camera. Facetime audio calls work fine - FaceTime recognises when the isight is turned off or disconnect, but fails to display video. The isight works fine since I can still do video calls using Skype and Lync. Even Photo Booth still works fine. Just in the FaceTime app won't display video. Anyone else had this issue ?