After completing the Chasing Echoes quest I returned to Castle Dawnguard... only to find I was being shunned for being a vampire! While this might make sense to some(with them being vampires and all), Serana is accepted just fine after showing her good intentions. So why shouldn't this go for the player, too?

This small mod should allow you to do just that. While it has not been tested with the first quest, every quest from then on should work just fine.

Thanks to Clockwordbard for this trick: if you end up getting stuck after the quest "A New Order", just attack someone and then either A) stealth, B) leave and come back after a few days or C) use a calm spell. Attacking them will break them from their busy state and advance the quest to the point where this mod kicks in and you can talk to them again.