Just chiming in that this "Invalid bitcoin address, please confirm your input" BS is still alive and well.  Count me as another screwed pooch.  I can't even believe how cross this makes me...  Mt. Gox can't expect to survive with this kind of "Paypal'esque" customer abuse can they?

Srsly wtf.  Telling me my addresses are bad to cover their lack of funds?  What evil.  Do they care how much time I wasted trying addresses from 4 different wallets before coming here to find kindred souls?