Forum:Expansion Issues

Hi, i'm having issues after adding the fallout 3 downloadable content. I added them after finishing the game with my last save at the beginning of the Take It Back quest. The expansion has added hellfire armoured enclave troops to this quest. My issue is that these troops appear as large red triangles with exclamation marks in them, their weapons float inside this shape and fire little versions of it. You can't target them and struggle to interact with them at all. When liberty prime kills them you can loot the shape to pick up the armour, when equipped you become one of these shapes..... I have no clue how to go about fixing this