Same here - I emailed Will about it yesterday - here is what he replied:

" I think this is the Tapatalk version of "Internal Server Error" that users are seeing on their browsers.

FWIW, my Tapatalk is working fine. But the Internal Server Errors are the same way: they affect some users sporadically and others not at all.

So I don't think there's an immediate fix. We're having trouble tracking this one down."