Occasionally, Runbox goes down.
It would be really nice if Thunderbird could be made aware of the fact that just because my username/password failed once, doesn't mean it's suddenly a bad username/password and I need to reenter it. It could just be server problems! Because, you know, that's what it always is, and they'll be back up soon, just like they always are.
In other words, damn it Password Manager, please quit flushing everything I had entered whenever Runbox is having issues. >:(