Board Thread:Skyrim/@comment-11260027-20130625152530/@comment-11260027-20130625165144

Thanks for your help. I'll try that. This link also looks promising:

http://forums.nexusmods.com/index.php?/topic/578287-fix-for-bugged-dragon-rising-and-maybe-others/

It explains how to check that no stage in a quest is left uncompleted. I'm thinking stage 200 of A Blade in the Dark is completed, but one of the earlier stages is not.