DLC isn't officially supported with trainers, so you may not find much help here. I know there were problems with the trainer options with just the main game, so you should probably go read through the main topic first to make sure your problem hasn't already been covered, or the solution already offered.
Yeah, I forgot to say that I didn't test the trainer without the DLC installed because I only used the trainer after I bought the DLC -- I found the final boss scene to be very difficult.
In a way, the bug actually helped me strategize the fight better and I finally got through it, so all was not lost
[Edited by PaulAlex7000A, 6/12/2012 12:37:46 AM]