I'm experiences a very strange bug in Logos 5.2.1.0067 (I'm on the Beta update channel). I use some personal books quit regularly, and they keep disappearing. When I rebuild them, they are OK, but the next day they're gone again.
See this thread. It was a problem that Logos tracked down and supposedly fixed. But maybe it's still there in some other form.
Maybe it helps when you switch to the stable channel and update to the latest version.
Yes, 5.2.1.0081 is the latest version. I suffered from this problem and since the server adjustment by Logos it has been fine.
