Google has shut down old appengine server

Official Google Announcement



Google shut down the old appengine server (Master/Slave Datastore). This caused steam rotmg, kabam.com rotmg, registrations for the main site, and naming accounts to go haywire. they have been fixed

MIGRATION MAY HAVE ENDED.

I'm using a custom swf file and it still work for me

It's back up now.