I also did a scan and repair, which let me get back into the game. However, all the items I had picked up during that session disappeared from my inventory and stash. Probably they hadn’t been updated yet. My third Haedrig’s Gift was still in my mail; I’m very glad I hadn’t yet picked it up.
Happened to me not so long time ago, fixed it by closing the game and killing every processes linked to D3 (blizzard update agent, battle.net, …) inside the task manager