The login stalls out at about 50% on all browsers and facebook's Gameroom. This has been going on for at least 9 hours now. I don't see any mention on Facebook's page for Dragon City nor anywhere here.
Have cleared the cache, rebooted, tried different IP addresses, different PCs, etc. Filing a support request will mean that tech will look at this issue in about 10 days, which is useless for all time sensitive games, like the Heroic Race.