Note that Hellfire Ring is still missing in the Battle.net API.
If your profile has this ring equipped, all your stats DiabloProgress will be invalid. It's better to replace the ring for awhile.
Blizzard developers promised to fix the issue in a few days. Battle.net forum thread.
We currently updating our code in preparation for Season 2 launch. Updates are currently disabled to prevent any data distortion in case there bugs/surprises.
Sorry about the inconvenience, hero updating will work again soon.