I still have to dig deeper, but it seems some of my track names/titles turned into filenames on a full rebuild scan (still svn-1333)… but only if the track was referenced in a .m3u based playlist. Not sure what is going on here… the rest of the metadata for the track is populated correctly. ❓
Is your music someplace other than “My Music”?
Can you try making hte directory that hte actually music lives in the first directory in your mp3_dir, then any other after that?