Member Rara Avis
Okay, this has now been fixed.
Unfortunately, the bug is going to have some ramifications. Essentially, because of a variable change that had nothing to do with the Library, your Poets list wasn't being written to your file and that's why you lost it. The really bad thing is that is was being written. If you have updated your Poets list since the move, the last poet in your list now has your list of favorite poets, meaning he/she lost theirs. Ouch.
So, if you go into your Library and discover a brand new list of Poets, that's what happened. The bad news is you'll have to rebuild yours again, and I apologize for that. The good news is that someone out there considered you good enough to put on their list.