the problem you are having is this:
I am guessing that you are re-playing missions that you have beaten. The problem with this is, in dling of the v1.1 patch, scripts have been changed and various things tweaked to improve the game. As a result, playing a game that you beat while on v1.0 will not work. All u gotta do is re-play the missions and they will work like a charm, but if u dont wanna do that do this:
in your consoul type in, maplist and choose from all of that maps!
hope i helped
