Are you sure you've got the latest version (it should say 0.8.1 on the top right of the main menu)? Also, what's the last day you've played (the final day in 0.8 is day 21, a Friday)
You might want to uninstall and a fresh install might have jumbled files, I've had this downloaded since .6 all I ever do is download the new version and update the game never had a problem...
You'll love the new update once you get it fixed this is by farm my favorite story I've ever read:)
Sorry, I don't know what would be causing that. All I can recommend is deleting your game files (your save should be stored separately, so you won't lose it), and then downloading a fresh install.