I'm finishing my play through of Force Unleashed, and I've gotten up to where you fight Vader on the Death Star. I battle him in the hallway, then he goes into the back room, with the hot floor. I fight him there for a little bit, and then he just ... stops. He doesn't attack, he doesn't defend, he doesn't throw things, he doesn't walk around, and I can't cause any damage to him.
Is this a known bug in FU? I know it was widely regarded to be an EXCEPTIONALLY buggy game. I'm playing the PC version on Steam.