I have the same problemI am stuck near the end. Despite what the walkthrough says, the gallery room says I need to do the scene with Stevie "boxes 2" in the warehouse, but it won't let me. When I talk to the manager, it shows a "Later..." screen and then acts like I've already worked with someone. Possibly more than one issue there, because despite that, it did let me work with the other two warehouse guys, but it won't let me work with Stevie. He just says, "Can we do it again?" and she replies, "We should try not to!"