The Machine and Her is a fantastic quest mod with an excellent story and companion as well as more, but to avoid sounding like a paid spokesman I'll stop with the showering praise and get to the simple point of this mod.  The Machine and Her contains a wild edit which removes a 'no collision' tag in a cell within the Glowing Sea, positioned over the Atlantic Record Office building(Or something very similar, I don't quite remember the exact name).  Without that tag, the cell will seem as if barricaded by an invisible force field that will stop the Sole Survivor from entering or anything within from exiting.

This mod merely restores that tag to the cell.  Being a relative amateur, the specific terminology I've used may be slightly inaccurate, but I verified that this patch remedied the specific issue I encountered after checking it within xEdit.

Simply position this mod after The Machine and Her in your load order and the cell will function as normal.