I sent a tech support report on this several weeks ago, but never saw a response:
OS:8.1
App: 4.0.8
* From the full screen screen lyrics/performance screen, I tap EDIT to edit the song.
* The song edit screen appears, split with the show song list on the left
* I make any changes to the lyrics, recording, midi or whatever, OK
* I then tap on another song on the list to save the edit
* At this point SLM freezes, and I have to exit and close the app. Sometimes, if I wait long enough, SLM will crash completely, but I usually don't wait.
When I open SLM, anything I had changed is there, so it is saving what I did. If make the changes back in the SONGS option of the database, there is no problem.