This is a issue that needs to get fixed yes there is a workaround on it but logging out for 5 min when you can have on average a 5 to 10 min wait to get into the game can be a real problem the other day I had to wait almost half a hour for members of my party to log out and get back in because the creatures in a dungeon we were running were not appearing for then though they could still be attacked I REALLY hope and REALLY recommend you fix this MAJOR MAJOR problem ASAP
because I am and many other players are very annoyed with the currant workaround