I picked up Lizzy after destroying her ship, then she didn't appear in the ship until the next turn. In the list of crew she was listed as F4, so I pressed the F4 key and all of the sound stopped and the game was basically frozen. If I pressed SPACE the ship would light up but not exit to the exterior view, nor would anything else work except escaping out to the main menu and loading again.
Once I reloaded I warped out and went to the last checkpoint on the map, but it didn't enter into the gameplay area, my ship remained on the map. The game displayed the comments from Biski, but I couldn't do anything after he finished. I had to exit back to the main menu and reload, then it started the final mission with Biski talking again.