While I was doing the Talent Pool quest and managed to recruit all 4 entertainers,I was unable to enter the Strip which also stops me from completing the quest.The gates to it keep on saying "Key required"....Seriously? What kind of bug is this? I'm unable to even continue the story quests to help Yes Man because of it.

Im having a similar problem, but with the the vault part at "The Fort" it says key required to get through this door and there is no key. its supposed to be unlocked by Yes Man who shows up on the big PC but it wont let me talk. so unfortunately im stuck at this part in the story mode O_O

Enter via the monorail system, it should then unlock the front door.

im having the same problem plus the problem with i put a spell on you so i cant complete any of the missions that involve vegas