Just found out about the game, and I really love it! Fantastic 2D animated graphics, of which Paradise Lust, What a Legend and Knightly Passions are unfortunately minorities on here.
I did see in previous posts that it's normal we can't advance some girls further (I too have Gabby at 60, Cath at 40, etc.), but I noticed that there are many pictures in the wallpapers gallery that are still greyed out. Are some just placeholders, or were they supposed to be all unlockable somehow? I did click on the ones in the Chatty app when they appeared, so I'm sure the greyed ones are some I never got anywhere.