Had this exact same problem.
Opened Bitcoin Core, which told me my database was corrupt and that I had to rebuild... I let that run for about 5 mins, shut it down, then restarted Armory. Armory then started downloading/rebuilding my database.
This happened after I upgraded to the latest Armory (0.93.3) which, after installing, told me it needed to blow away my database and rebuild, which I agreed to.