I updated the photo-gallery software tonight (standard security update), and noticed that the picture rating part wasn't working the way it used to. I found a new setting in the admin config that allowed me to revert that feature back to the way it used to be. That's the good news. The bad news is that if you voted while the setting was the 'wrong' way, you only give images one star out of five, and you can't remove or change your rating.
I also updated the security in the forum a few days ago.