Crash on Rannock locks the screen when "Kriton shows his back as you shuttle to planet".

I've played this game before and it took me along time after the ending disappointment to play again.  Now, why is this the only intro that locks up on me.., unless the option to do this mission is a mistake because the only mission I'm apparently allowed to do on Rannock is destroy reaper base of course blowing up reaper.