I have found the evidence that proves the Legion will kill the Khans after the NCR is crushed at Hoover Dam, however, I cannot turn it into Regis. The quest doesnt even give me credit for finding the evidence, yet the quest marker goes away for the evidence's location. I try talking to Regis, but I keep getting the same dialogue options I usually get for him in regards to turning the Khans against the Legion. I tired reloading before I start the quest and find the evidence first. Nothing. It didnt work. Regis wont respond.
Obsidian/Bethesda, before releasing DLC for this game, try releasing patch fixes first.