Hi Jon,
I can't see anything in the fileWriteActivity.txt or fileHistory.csv file pointing to any specific issues. It does look like your set list has been corrupted somehow as clicking on one of the songs in the list opened a totally different one as well. There is a button you can use to fix this if it happens again - you'll find it by opening the set menu, clicking on the + button and then selecting "Rebuild set". I've not been able to figure out why this happens sometimes. I can see from your fileWriteActivity and flleHistory files that you changed the capo setting on a few songs, but I've repeated this and also tried shuffling the set a few times, but I can't get the bug to reproduce. I did see something similar a long time ago and that's why I added the rebuild set button. These are the annoying bugs - unable to reproduce, and yes, I think it is linked to the previously reported bug. Somehow the app is trying to open a song that it thinks is already open (so nothing happens).
Gareth