My Logitech VUBM46 camera was working perfectly on my Mac Mini. Now on Google+ the other party can see me, but I cannot see them, and the small video image of my output does not appear on my screen. I went to "settings" and the Logitech Video icon is greyed out. Audio is fine. Problem exists on both "default device" and "built-in output" settings. I am a dummy, and need help.