Found another bug, this time in the 15.1 release.
Entered private dungeon on my own, nothing in there except the starting bed. Then upon leaving I'm prompted with "loading error Failed to load: img/pictures/zbg-0.png". A 'Retry' button also appears but clicking it seems to have no effect. A hard reset is required to get past this.
In addition loading the autosave made in the dungeon gives me the same error and locks up the game again. This is perhaps the most annoying part since for me my last actual save was almost 20 minutes before, so that's 20 minutes of gameplay undone.
Hopefully it's a simple fix - it looks like a corrupt image. Thanks for continuing the work and making the game openly accessible Indivi!