The gallery doesn't help me much in this case. AFAIK it wants me to continue donating to Max's cause, which I have done already on multiple occasions.If you go into the gallery, it should tell you what you need to do for missing scenes.
Also I can't seem to get the Cassandra quest started. It seems that I am supposed to spy on her in Debbie's room. "Sadly" Debbs is busy in Amy's room, so that seems to be out of the question either.
As much as I love the game, the way the game keeps track of quests is not exactly great. Not only are there three tabs under the quest tag, it doesn't even tell you that there are more quests available, unless you stumble upon them by accident. Some stuff you can only access under the characters tab. It is a bit confusing. Especially, if some of these things seem to cancel each other out.