I did meet Allie in the cafeteria in Chapter 3 and I got that phone call in Chapter 6, so I was on the platonic branch.
For the dating line bug, I don't remember all my choices, but he was at 90 affection, had told me about his mom, lived with me for a week, and changed his major to archeology. Right after he got the job at the museum, the script was talking about him hearing from his cousins and then it said since we were dating, his family had contacted me too. I made the remark about his dad, he told me the news about switching majors, and the route ended.
If you need more information, I can replay James's route and write down my exact choices.
EDITED: I found another bug at the end of Ava's route. If you make Allie the new record keeper, the scene repeats itself over and over.