I'm stuck on the objective "Confront Professor Marty on the bridge". I've already gotten access to the bridge, but when I go there it's empty and, as far as I can tell, I can only examine the key card reader and the door.
I checked the walkthrough, and it suggests there should be a robot looking for a dance battle. I've already done the dance lesson in the holodeck, and I'm pretty sure I've done everything else in the walkthrough up to this point. I may have missed some of the minor things (like examining an object that gives you points for doing so, but doesn't do anything else to progress the story.)
So, are there any other prerequisites to the dance battle, besides having done the lesson and getting access to the bridge?