i was going back on my saves to get all the endings for the achievements and i got to the point on the Railroad quest line where i talked to the synth at the institute and he told me that the brotherhood of steel knows the location of the Railroad HQ and i need to go warn them, i go there and i try to talk to Desdemona but i keep pressing A to talk to her and all she does it mention my past quests that i did for them, and if i keep trying to speak to her she eventually just says "I am busy" and after that just keeps repeating dialog and gives me no options at all so i cant get the Railroad ending. Has anyone else had this happen to you? is there a work around and does Bethesda know about it?