That happened on one quest on PC. I had a quest in a building and the door wouldn't open until I logged off then back on. Possibly a bug. You need to report it to ZoS and be specific.
RicochetX88 wrote: »I played some pvp for 2 hours last night and couldn't see a single NPC, nor could I fight any. While zerging keeps I would be randomly attacked by nothing, everyone else could see them and attack them, but not me! I realized it when I ran through an enemy logging camp and saw fireballs fly at me from thin air! Lmao