I recently returned to a Dovahkiin character I haven't played in months and discovered all his spells and items from Dawnguard were gone. There was also no record of -any- DG quests in the journal. I load other characters and they were all fine. So I took my Dovahkiin back to Skyrim (been hanging in Solstheim) to discover that Fort Dawnguard was an undiscovered location, though Castle Volkihar was.

So I went to FG to discover it had reset to how you see it the first time you visit. Vigilant Tolan was hanging out inside, but so were Agamaer, Serana, and Isran. None would talk to me and everyone else was gone.

Tonight I'm going to visit Castle Volkihar and see if Harkon has resurrected.

And you other saves, they are working fine ????

Are you saves all auto-saves or you save manually as well. !!!!!

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I forgot....have you tried to clear your cache ????