I totally forgot about that! Yes, we modified some DB parameters to improve performance of building and scanning, and it's necessarily incompatible with the old databases. You will have to use "Help"->"Rebuild & Rescan Databases"
I tried the "Rebuild & Rescan Databases", but it still crashes once it's finished syncing with the network.
Can you send us a log file? Or post any seemingly-relevant errors you see at the end of of armorylog.txt or armorycpplog.txt? It's especially interesting to us if the DB build & scan used to work but doesn't with the new version (because we added stuff that was intended to catch and handle errors in blk*.dat files... maybe that code is misbehaving?)