In the main quest mission "For the Republic, Part 2" I was partnered up with Rex and Boone.

When I went to the strip and entered the Lucky 38 to "Remove Mr. House as a threat to the NCR" then exited Rex and Boone were no wear to be found, yet when I try to get Ed-E or anyone else to join it says that I can only have one companion at a time.

I reverted to a save point before I completed the mission but I was still inside the casino and still no Rex or Boone waiting outside or inside, so as soon as you enter the 38 they disappear.

What's the deal!? This is the firs major glitch I've experienced next to a few freeze-ups so I guess I'm lucky.