After leveling to 36, the bulletin board had a 2 level 37 quests available with a yellow '!'. After I took the first (the "De Valles Inhieritance" quest), the question mark turned gray, even though the remaining quest (the "Peril of the Dryads" quest) was also L37. This only an issue of the marker color, because the BB menu can still be selected and the quest still taken.