I can think of a couple reasons. One, you have CCleaner on (but you just said that you don't, so forget that idea). Second, you're playing on unofficial website that doesn't allow saving. Third, you are playing on a Surface, meaning that Flash games don't save. Fourth, you don't have the webpage with the game favorite (which forces the computer to save all cookies from that webpage).
If none of these are the case, then I'm not sure what to say. If you describe the problem further and explain the steps you've already taken to try and save your game, then I might be able to come up with something.