I just added a patch to the game that will report loading errors. Try loading the game again (if you haven't already started a new game) and if you see an error screen, please post a screenshot in the support thread, and maybe I can get to the bottom of this. Thanks and sorry you lost your save!
You might want to look into having a way for the players to download their save file periodically (I think cookie clicker does this but I think they are using Javascript). Not sure if it would work with your set up, but it might be worth checking into since I'm assuming a lot of updates will be happening with the popularity of this game. That way if someone loses their save data, they can import their last save file and not lose everything!