0x6368

From the debug files you provided, It looks like it is working fine. The library creation was in progress, 103 tracks are processed.
Don't forget that the first time, it downloads every artwork so it can take a while!
 
So if you killed the update library, you can restart it by executing "update library".
 
Then be patient

Thanks for debugging this!
 
I think I understand why, I've reproduced by adding a folder at the end of my playlists, see "test" folder:
 

 
Can you confirm it is your case?
I'll provide a fix shortly