Ok here the story im doing the quest the House never wins III....i've convinced the Boomers leaders to help on the day of attack on the DAM...the quest tell me to get back and inform Mr.House....but strangly i cant have access to the strip anymore...tell me the door need a key and cant be pick....i dont wants to kill the boomers leader(as optionnal) but i cant go back to the strip anymore...???? any clues on that (possibly Bugs again)???

Never mind...if that happen to you also....just Sneak(hidden) attack kill in one shot a seccuritron in front of the gate...they have a key.