I'm about 60 hours in on one play through and I've been in and out of Silver Rush many times, ran their quest line up until Gloria asks me to speak to Jean-Baptiste, no issues encountered. Unfortunately, due to a bug (big surprise there) Jean is located behind the red, locked door, up the stairs... Since I wasn't going to continue the quest line anyway, I decided to complete Cass' quest line, Heartache By The Number. I went to all 3 of Cass' trashed Caravan's, then get the evidence I need from both the Crimson Caravan and the Silver Rush with no issues. I was not caught stealing in the Silver Rush, the NPCs did not become hostile at any time (As a side note, I left Cass and ED-E outside during this part). I turned in the evidence at the Mojave Outpost to complete the quest. After that, I dismissed Cass and traveled back to the Gun Runners to sell some stuff. I decided to head into Freeside after that and the moment I got into the section where the Silver Rush is located, the Crier went hostile and started shooting at me. I thought it was a fluke so I reloaded my last save and tried again. Unfortunately, it was not. The crier is hostile, as well as every member of the Van Graff group. I have completed Cass' quest this way before and the Van Graff's were not hostile towards me. Anyone know what the heck might have caused this?

Not a bug; patch added feature.

Well, considering the following:

Crimson Caravan doesn't also become hostile towards you, which only makes sense since you've ratted them both out.
I still want to use them as a vendor.
I still want to get in and out of the Atomic Wrangler.
Jackson tells you not to touch them after turning in the evidence.

I'd said it's a [censored] poorly thought out "feature", no? :banghead:

I have this dumb ass glitch, too. Way to go Obsidian. :facepalm:

I am going to see if I can mod around it.

Van Graffs are all dead. Problem solved. :flamethrower: