I tried a different saved game, from before I first crossed the NCR, and when I met the hit squads again, it all worked fine. So I''m thinking the problem is after the first hit squad gives you a three day warning, I shot them all as they were running away, and now the dialogue is broken. So maybe by shooting them, that the cause of the error?
Why are there so many glitches in this game? I've never played a game with this many bugs before. It's a shame, cos it's the best game I've ever played, so I wish they'd fix this stuff. There are still quests broken as well, I noticed. I can't start Aba Daba Honeymoon. And I'm sure there''s a bit of a lag again now, with this new patch. The last version was perfectly smooth for me.