I think Miranda say at the next start something like: The Profile-file is corrupted. (Will write the full Message, when it crashes again) Then the .book is much thinner then it should be, and a check for the mails does no more work. So i stop miranda, put my backuped .book in and start, and then it works again, sometime for 2 Minutes sometime for 2 Days. But also many Time it crashes, and i can easy restart miranda and it works without change the .book (sorry for my bad english, hope you understand)