Until I read about this over on the BD forums, I completely missed this. If you look on the left of the client/launcher, next to where it says “Neverwinter Nights Enhanced Edition”, is there a big blue dot? If yes, do you have one or more of “Infinite Dungeons”, “Pirates of the Sword Coast” or “Wyvern Crown of Cormyr” installed? If so it might pay you to select the DLC (in turn if you have more than one of them) because there have been updates to them as well as the main game.
TR