Glad you're enjoying it ^^ Chapter 4 should have been completed before Avenging Angel started. Do you have any other quests active?
So I have no main quests active, down with the bad girls is an active side story, which I think triggered from the dream sequence. Speaking of that, couldn't get it to let me plant the virus on the computer, for whatever reason so I had to leave the dream. I have the friends with benefits and quiet ones relation ship quests. I know I completed chapter 3, but I didn't notice anything for 4 happen. I did the quest about starting the club with Jess, and I did the poppy quest where Missy is a slave, followed by avenging angel. My understanding was chapter 4 was supposed to have Jess be the main thing going on, but maybe I'm misunderstanding what the content of chapter 4 was supposed to be? maybe I played it without realizing it.... :D
Oh yea, there's one other little oddity that I found. During Avenging Angel, after the whole isolation thing, you have to publicly "apologize" to your teacher in the morning at school. Well you can completely get out of that morning punishment by making Missy late to school. ;-) I wanted to see if something even worse would happen if Missy was also late, but it just treats it like she apologized, and lets her off the hook entirely.