Okay, I think something is corrupting your save files.
(Assuming you're using chrome)
Go to the game and press F12 to open up the console. Click the "Application" tab. On the left open up the "Local Storage" menu. Look for some jumbled url, click that. Can you delete "saveFile1", "saveFile2", "saveFile3" and then see if the game works? It should automatically create new save files when you boot up.