Multiple errors in log (paths and tags look ok)

[Barbie-qu]

Ok, i've been doing some more testing, and here are my findings:

Steps taken:

I created a test playlist of all the files that showed errors.
Then Rescanned
I saw that there was an increase in the number of errors equal to the number of tracks in the test playlist. i.e. rebuilding the playlist from scratch did not mean the tracks indexed correctly without errors.

Within MusicBee I moved one album (Andy Stott) to X:\MinimServerTest\Andy Stott\Luxury Problems
Note: the subfolder structure and file names were unchanged from before. i.e. \Andy Stott\Luxury Problems/01. Andy Stott - Numb.mp3

By moving the files from within MusicBee, all the playlist pointers should be updated as well. To make sure I verified that the path had updated and manually saved the playlist.
I then added /volume1/music/MinimServerTest to contentDir
Rescanned

Result: the album i just moved (Andy Stott) does not show errors for ANY playlists now.

So it looks like the move of location solved the error.
Any ideas? It feels like a bug to me.