Apple Mail 8 shows welcome screen on every launch

I recently upgraded from Lion to Yosemite. Now using Mail 8.2 the welcome screen shows up with every launch of the program. Dis- and reenabling the IMAP account like proposed here did not fix it. What can I do?

Has invited:

howapple - hello

Favor from:

Yes, but that did not make a difference as well. I fully deleted `~/Library/Mail/V2` as well as `~/Library/Preferences/`, rebooted the system, re-added my IMAP account and had my ~50k mails re-indexed. This took about two hours but now behaves as expected (at least in this case). Another poor Apple job in being verbose.

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