Crash after adding instances

I added a 2nd instance so I had one calendar and one task.

It worked until I closed out, and then the next time I logged in.

it crashes every time on startup.

I uninstall, and reinstall and it works again.

Can you not always have two instances?

It died once when I had 3 instances, and tried to delete one, and another time it died when I tried to rename one.

I'm using 1.5.4 and it also happened on 1.5.2