I once started working on a questmod when all this dialoug/quest bug thing came up. I had this problem too and because of this (and RL things) I stopped working on the mod then. Recently I thought, I should continue my work.
The quest is not "start quest enabled" so I won't need a seq-file, will I? Anyway, the dialoug works fine as long as I don't coc into my cell from the main menu. But: My scenes won't start.
I have a small dialoug, after which a quest is started. This quests only purpous is to run the scene when started. The scene itself is the actor (the one you were talking to) walking to a x-marker. But he doesn't... Navmeshes are generated, btw.
Any suggestions?