So as the title says Chasing Echoes won't start. I've toggled all my mods' .esp's, reinstalled dawnguard, everything. When I try to use setstage I get the beginning dialogue for the quest (where Serana tells you about the courtyard in Castle Volkihar) but the quest isn't added to my journal, and I can't open the door to the courtyard. What the hell am I supposed to do?