I dont know either? when i open the game from winrar downloads its perfectly fine and saved, and if i use the regular way, it just doesn't save.
But i guess its fixed now, since it works? Not sure why i needed winrar to open it.
Somehow unzipping it, doesn't let me save the game, but playing frm zip folder does. Its a weird situation but i've seen it before, so it might just be a problem with my browser.