Unable to start "The Big Score" missions

The "H" mission marker appears at the Vanilla Unicorn however I can't trigger the missions to start. The back door is locked and I can't get into the office via the strip club because the bouncers won't let my characters through. I have tried taking a taxi, fighting off the bouncers, reinstalling the game data utility (as suggested by R*). I've tried using different characters, I've tried the trick where you place a character on the roof and switch back and forth so they appear in the office. This gets me inside but the H marker then disappears. I'm out of ideas.

Has anybody found a way?

I hope Rockstar fix this in the next patch because I have literally completed everything else in the game. At 85% completion I do not want to start again.


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