haha this damn bug happened to me when i started the "Diplomatic Immunity"
link here>
http://www.uesp.net/wiki/Skyrim:Diplomatic_Immunitynow i talked to delphine meet her in solitude and give my weapon and armor to get back after sneak out the party.
but after this the quest said to me talk to "Malborn" but i didnt see it(seriously) and get to the party in the carriage
i get into the party and only there i see that i needed to talk with malborn
but i saw on the map he was veeeeery away from the party i couldnt fast travel so i get out of the thalmor embassy and used the console to unlock de gate(i'm on pc,selected it and wrote "unlock")
so i could fast travel and meet malborn in middle of skyrim close to dragonbridge,crazy bug,and malborn didnt go to the party and just stayed walkinga away
so i used console to unlock the doors on thalmor embassy and complete the quest
but something remains,i couldnt sleep or wait in any location
the game recognizes that i still on the party(and make some weeks that i've completed that quest)
how can i fix it someone knows?