Hmm, there's been some updates to the game's files so the saving got changed a little bit.
When you extracted the game's .rar file, did you find a www folder with a save folder inside of that? If not, there needs to be one. I heard reports with Zombie's Retreat that some players were extracting the .rar and the www folder was not extracting with it. I plan to make a change that should prevent that in the future but let me know if that was where the issue was occurring!