Interesting (and concerning) that this hasn't come up before. I'll take a look into this soon, but just to clarify, when you say quick save what steps are you taking to save the game?
Thanks for including the g_debug logs, the important ones are there. Looks like last save slot is returning false and trying to load anyway. I must have failed to put a failsafe to break out of that command if it doesn't detect a valid save file. I don't currently know what's causing this, but I have a concern that it's an issue with file read permissions. Could just as easily be an oversight on my end.