Ira, thanks for your help. I ended up doing a wipe and started over. It fixed the problem, but naturally I had to spend time resetting things.

I think you are spot on with the email corrupted database. I couldn't delete anything (except new emails) on the device. There is an option on the DM to "delete data", and I selectively chose the messages. Just got an error message asking me if I was still connected to the internet.