Can't talk to certain NPC's in New Vegas, all they say is "Go away, bleeder!"

[DickForce95]

I'm having an issue with New Vegas after modding it that makes certain quests completely impossible (most of them modded in) in that certain NPC's don't have any dialogue options in that I can't actually talk to them. Instead of entering dialogue, I simply get the unvoiced response of "Go away, bleeder!"

Now normally I only get this for random NPC's just walking around that don't really have important dialogue anyway, but so far I've encountered two modded quests that simply cannot be completed because of this bug, the most recent one being For The Enclave because I can't talk to the quartermaster and get my power armor.

I've looked up this bug in other places, but I've only seen it in regards to Fawkes in Fallout 3 with Tale of Two Wastelands and A World of Pain. While I *do* have TTW installed, I *don't* have A World Of Pain installed, and Fawkes wasn't one of the NPC's I ever had any problems talking to.

So I don't see what the issue is. If there's any way to fix this, that would be excellent to know.