This quest won't start at all. I have finished Bloodline by refusing Harkon's gift and got banished. After that, nothing happens. Bloodline quest is marked as finished, but there is no new quest available.
I then went back to Fort Dawnguard, but there is no vampire attack, and speaking with Isran doesn't bring new discussion options.
I had some saves however, and reloaded, then started Bloodline again. This didn't help.
I tried to use the console, typing 'setstage DLC1hunterbaseintro 20', but that does nothing either.
This is a real game-stopping bug. Is there anything that could be done? Could this bug be because I have several mods installed? I have also tried to disable them, but that didn't help either.