I found out a few days ago that this issue is present on my "new" game that I started AFTER installing Dead Money. Older characters that have saves BEFORE the DLC was installed can get into the bunker. But my new character can't.
Trouble is my character is already level 40 and has one or two DLC exclusive perks (Light Touch & Grunt), so I can't uninstall it, reload/save game and then reinstall it (tried and I just get a blank screen when trying to load the save game).
I really, REALLY hoped this would be solved in the new patch since a lot of people have complained about it already and the obscure lengthy fixes only seem to work for some people (probably depends on what perks/level they are in their save game).
Is this likely to be fixed in the near future? :brokencomputer: