I just played a fantastic game of AH over the weekend, but I ran into a situation that has never occurred to me before.
We were using Mandy Thompson, and I managed to trigger her Personal Story success. The result is that a location on the board with a gate is chose and the location is sealed and the gate removed.
My dilemma is that when this triggered, the mystic environment that prevents investigators from sealing gates ("No One Can Help You Now") happened to be in play.
We played that the gate was sealed anyway using the logic that personal stories did not exist at the time the of the writing of the Mythos card and that Mandy's story and the name of the card imply that with success the investigators are breaking the rules of the prophecy that foresee unescapable doom. The name of the story card, as example, is "Breaking the Chain." Additionally, the pass condition requires 5 gate bounces off of sealed locations (which is not all that easy to do...and if you managed that, what's the harm in another seal?)
Is there an official ruling or errata that suggests personal stories supercede other effects or anything opposing our ruling?