I just got the DLC disc of Fallout 3 GOTY. I'm trying to start Broken Steel. Whenever I enter the (warning: spoilers) Project Purity Control Room, and fight Colonel Autumn, then clear out the room, Sarah Lyons comes up to me and says "we need to lock this room down", or something similar to that. However, whenever she says this, I've already cleared out the room, and talked to the scientist via intercom who tells me the Project could explode. I've tried this several times, and I get the same result. Anybody else having this problem?
Haven't played Broken Steel yet, is this it?
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http://fallout.wikia.com/wiki/Take_it_Back!