I agree, the symptoms and the contents of the logs do not indicate a permissions issue. Something else is going on that we don't yet understand. But I am confident I'll be able to figure it out once I get a look at your machine.
No problem scheduling our meeting for next week, how about 11am PDT:
1. Please join my meeting, Monday, October 20, 2014 at 1:00 PM Central Daylight Time.
2. Use your microphone and speakers (VoIP) - a headset is recommended. Or, call in using your telephone.
Dial +1 (571) 317-3112
Access Code: 816-936-589
Audio PIN: Shown after joining the meeting
Meeting ID: 816-936-589