Okay, I took one of the non-working songs and put it in a folder with another song file that worked. I did this for both the internal and SD card. I set it to play one file (didn't matter which one), it would skip (even if it was one that didn't work before) to the 2nd file but then wouldn't skip anymore. I'm thinking that maybe it's reached the end of a folder with a particular file and thinks that's the end of the playlist or something. Going to try again but will re-initialize the database first this time. If it works, I will post. Else, assume it doesn't.