I crashed on dungeon level 9 and for some reason it wiped out the current autosave and replaced it with an old one. When I went to reload, my autosave was from back on dungeon level 7, so I lost a couple of hours of progress. I wasn't doing anything odd when the game crashed, just meleeing a couple of creatures. I'm running Mac OS Snow Leopard, Steam version, 1.0.10 with ROTD active. The crash report is attached.