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.