Forum:Broken steel add on trouble - xbox

I am having a problem with the Broken Steel add-on. I was getting the main story line glitch where lyons keeps telling me we need to secure the area. I read that this could be fixed by deleting and reinstalling the add-on. So I reloaded a previous save and tried that and all is good. HOWEVER, I keep completing the game, go through the entire ending movie, get the clock (loading) screen, only to have my screen go black and NOTHING happens. I've tried several times and many different endings, and I don't know what else to try. Does anyone have any suggestions?