Are you sure you're running "Big Brother: Fan Game"? There's no section named "Gallery" in this as far as I know.
If you're talking about the "Achievements" tab in the phone menu, that should be working fine.
I just tried downloading the newest version (including fix 8) and loaded an old save game. I was able to replay previous scenes through the Achievements menu without problems.
Again, are you getting any error messages? If so, what are they?
If you don't get any error messages, please try to describe what things you click and what happens.
Either way, I'm pretty sure you'll need to try to re-download the game, including the newest fix (fix 8), and unpack this to a new folder. In order to move your saves from one installation to the other, simply move the "saves" folder, which you'll find under "<your old BB install folder>\game\".