Most I can say is that thread URLs have changed. Best suggestion I have is to hop into character creation, go to the filters, and put in your account/sub-account in the "posted by" box, and then hit go on it. That's how I've been finding mine so far, because nothing else shows enough results to find what I'm looking for.
But if the thread is there but nothing is in it because the image itself got deleted or whatever, as best as I understand it you're out of luck.