On my oldest character, I've done this quest a long while ago (maybe back in 2011). Today, I loaded up the character, only to see that both Sailor's Repose and the journal entry for the quest are missing. The lighthouse and the abyss, however, were still marked as "Cleared", and I even had Mani's cellar key still in my inventory. I went back, killed all chaurus again, got Habd's remains, put them into the fire, got Sailor's Repose, but still no journal entry or, well, anything. Is it some known issue? Because while I fixed that one, I'm not sure if there were any other quests that I've completed that also disappeared. Could it have something to do with the add-ons, or deleting save files?