watching the JS Network console, I see a POST that hangs for a while, and eventually comes back with a 500:
https://www.dropbox.com/s/180qhle14wdsjta/Screenshot%202015-04-30%2016.19.39.png?dl=0
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(Well, slight clarification: I should say probably fixed. I guess we'll know once we update, but any future discussion can take place in T7664.)