I'm not sure about the second one. I've had it enabled, except for the last run, so I don't know if the songs I picked up were analyzed with it on. My best guess is no, these were the most recent songs.
Definitely beaTunes. I created a playlist specifically to test
this. I make sure iTunes can find all songs, run beaTunes,
synchronize. iTunes cannot find a few of the songs just analysed.
When I check, these songs have .old and .tmp extensions.
When I untick AmpliFIND and all online resources, the problem disappears.
Another thing: is it possible that song ratings are imported from online sources? A number of my songs have ratings that differ from what I gave them, and there are 1/2 ratings, like 3 1/2, which I don't have in iTunes.