Downloaded greyface latest mm8 patch.
Delivered the letter to Arion Hunter, saved his family. His guards didnt become friendly. Edgar Fellmoon still asks me to deliver a letter to Arion Hunter. Quest log tells me the letter is delivered, report back to Fellmoon. What can be done?

getting the letter back from the seer and turning it in again could help, maybe?

Sir, if you ever decide to run for president - you have my vote!
Thank you it worked like a charm! Seer gave me the letter, Arion updated the quest and so did Fellmoon.