Worked on the tower for my main house, took some screenshots, then the game crashed to desktop. When I came back, I appeared at the start circle, and it was Day 1. I had my inventory, but the heads of all the bosses were gone (through Yagluth). Swapped some world files around, got the trophies back in the circle, but hours of work on the house are gone.
Now the game crashes to the desktop while loading the world at the splash screen.