I'm having the same issue right now.
No response from Mt. Gox yet.
I really need this transaction to go through as soon as possible.
This is the second time an issue with a bitcoin withdrawal from my Mt. Gox account has caused me a big headache.
The error I get is:
"Invalid bitcoin address, please confirm your input"
Even though the address I entered is correct, along with all the other form data.
I even tried used alternate addresses.
"Thank you for the email. It appears for some reason this error is triggered from the platform for few BTC withdrawals specially, we are currently investigating on the cause and the solution. However please drop a line if you were able to withdraw after a while. We appreciate your patience and sincere apologies for the inconveniences caused."reply form support team