For some reason, I can't get FaceTime on my MacBook Pro running 10.6.4 to sign on. I already have an Apple ID. I've been using FaceTime on my iP4 in this same wifi network for months. Anyone else have this problem? I've seen a few comments scattered around the forum, so I figured I would make a thread to centralize the discussion. Anyone had this problem but figured out how to fix it?