Ok, so I tried logging into D3 all day, and I keep getting a popup "An internal error occured, please restart. If problems persist contact customer support."

I've tried the steps on post http://us.battle.net/d3/en/forum/topic/7199642111
I did steps on posts # 3 and # 5 with no solution

I notice errors in the file Users/Shared/Battle.net/Agent
One error is from May of 2012, so probably not important? However, one is from yesterday:
"Blizzard Error", cannot open.

I have mac osx 10.8