So I finally got around to doing this quest, since it wasn't working properly prior to the last hotfix (the whole thing with the Delamain calls). I found all the cars and got to the phase of going back to the Delamain HQ for a reward, but Delamain is not showing up at the reception desk - he's not on the screen and his dialogue is missing. I can still pick my lines and finish the quest, but his screen is just black. I've watched other people do the quest normally ... and I was seeing him in the beginning of the quest (again - prior to the last patch and hotfix). I tried reloading saves, restarting the game, changing settings from the options... even started a new act on the story, but the bug persists.