I was just about to ask this question...
I don't have firefox, but I have an HP PC, not a Mac, so I'm using IE. But my error message keeps telling me I'm not logged in (though right above it it says "logged in as redhead" and then a link to log out). hmmm.....
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Never mind! I found this. Sorry, I'm still finding my way around- apparently you have to have 25 posts before you can get into chat, if anyone else is new like me and didn't know that.
sorry guys!