Yeah...its on Geonosis, where you have your sniping position right at the end of the level, and there is a ship on the end of the platform. When the ship takes off the sniper is suppose to shoot it, but mine never takes off, even after sitting there for 40 minutes. I followed the walkthrough, but that didn't help.
I think it is a glitch in the game for me...so I figured since I was so close to the end of the level, and I know I could do it, I did the level cheat and went on with the game. Just beat it like an hour ago...fun game, not too crazy about the end, but hey whatever.