This has happened to me 3 times now, and it is quite frustrating! I've been playing for a month or so now but haven't been able to beat the game on Easy because of it.. I will play a whole bunch until I have to go to bed/work/whatever, save, and then when I come back to the game it reverts to an ancient save! For instance earlier today I had actually made it to Floor 9 and made sure I saved because it wasn't the first time this issue had happened. I even checked "load game" before I quit for good to make sure, and yep the screenshot was of me on Floor 9. Now I go back to finish my conquest, and my save file is back on Floor 5!!! There is no way I have the heart to continue with my hard work erased like this. What on earth is going on..?