[musichawk]

Thanks Mike, that should work. MSP is telling me where it is looking for each PDF (as an error message), which confirms they were all in one folder (I don't put each song in a separate folder) so re-copying the files should work. 

Elaborating on what happened (in case it indicates anything), I was in the midst of working through an MSP list of songs, had viewed several, then in a 2-page song, swiping to page 2, MSP froze and crashed closed. Restarting MSP, all songs were just partial on-page (1/4 of a page, for instance), or black. I restarted the tablet, and then MSP reported that every file is missing. I don't see how MSP could have wiped out all the song files, but it happened while using MSP, so I'm clueless about what problem might exist.