Read Thread: Mailbox?
I wasn't even sure what you meant by this, so I logged into your account and it appears you minimized your AQ mail widget. And I thought--ah, that's what you meant!
So I maximized it again. Click the + button in the upper-right corner of the page to expand a widget and the - button in the upper-right corner to minimize it. (Which is what you apparently did at some point.)
Oh thank you, it's working!
Must have done an accidental click.