My quest where set up in a chain event so one ending triggered the start of the other , but all had to start with the final stage of the main quest ...
it used to work fine until lDawnguard updated the game and now the courier that was arriving befoure do not arrives anymore ...
Also when I loaded places at half stage of the quest there is nothing ...
I tried to make the quest start by setstage ingame and nothng happens ...
also the dialogues when I tested some time befoure at the first patch release but befoure dawnguard for pc lost all their timing and got reverted to instantspeedy dialogues flashing for less than a second under the screen ...