Messages is updating stuck

I'm on Sierra, 10.12.6, all updates. I had Messages working, then wanted to reset it, after trashing preferences and the database, I got the endless updating notice. I found this to reset Messages:

1. Quit Messages
2. Kill the IMDPersistenceAgent process via Terminal with

   killall IMDPersistenceAgent

3. Trash Library > Messages folder, and find preferences with Messages, iMessage, or iChat in the name and trash them.
4. Empty the Trash.
5. Clear the preferences cache by running

   killall cfprefsd

   in Terminal
6. Restart the Mac.

This worked for me.