I followed Delphine from Riverwood to the burial mound and killed the dragon. The quest journal says to speak with her, but there's no dialog option to advance the quest. There's a couple older dialog options about being dragonborn and the thalmor, but niether update the journal.
I've tried previous saves with the same results.
I've loaded vanilla and tired it with same results. I only have one weapon mod, but trying it without it didn't help.
I've tried running the entire way and again fast traveling, but it didn't help.
I can finish the quest via console and it gives me a key to her secret room at the inn, but the next quest (Diplomatic Immunity) doesn't start. She walks back to Riverwood and doesn't offer any new dialog to begin the quest once there.
Does anyone know of a way around this? It would be devastating to have to start over at this point. I have finished the Thieves Guild quests, Dark Brotherhood quests, thane in quite a few places, collected many of the daedra artifacts, etc. I was sort of saving the MQ for last. =/
Thanks for your time!