I have a complex home I've been working on. It's multi-level, and positively delightful. The problem is that although it opens, at the moment it won't save. I can open it, move an object one tick to the left and back, save, and I get an error. Terminal output and dialog box output are here: http://pastebin.ca/2411279

I don't know why this is happening, but I'm not afraid to break out the hex editors if necessary.