Actually all you have to do is change one value in system txt file in the save folder from a 0 into a 1. I've tested this myself by changing it to 0 and the gallery locked up and by setting it to 1 it unlokced.
To be specific you have to change the following value:
[Clear]
Clear=0
into
[Clear]
Clear=1
To be fair I'm running this on my Mac with Wine. Will try this on my pc because maybe the Wine wrapper is not reading the system file correctly.