Harbinger Crafters had something to do with it... no but seriously, what's HC?
PS: If you're talking about TFB, there's also the question of those mysterious panels in the datacore rooms. Perhaps you have to stealth past all the core rooms until the last one, and use the panels (deactivate the cores or whatever) in reverse order back to where the rest of the group is, and then it'll work? Also, maybe you need to click the panel from behind so the fight doesn't start? (LoS it?)