Well,the quests are ramdomized between Sorine,Gunmar and Florentius,so you may be just overly unlucky.Keep asking what you can do to help and you'll receive it one day.
Not if Baenius will not give a quest or even have it listed in his responses. He just rattles on about either the dawngaurd, what he has for sale and one other that has nothing to do with asking him for work. This was a load of hours just to get to this point in Dawnguard and now no quests. Sucks for sure.
I have this glitch as well, any solution to this?
Leave the Fortress, then wait three in game days. Come back and see if he still has the problem.
If it persists, hit him four times in succession (making him hostile), then yield so he becomes passive again. It should have the same effect (but a different method).
Check your quest log you may already have it, that’s what happened to me