It only seems to be for one of my characters, a Night Elf on Khaz’goroth and the arrow’s not worked since I started this character.
try typing /dugi fix
can you press the green dot on the small frame this should display the waypoint arrow.
Do you see the zone map? try disabling the Zone Map by clicking the DG icon and untick Zone Map
Also when I load dugi I have to login all the time and it still showing me as trial user but I seem to be able to use the guide in game ok.
This is because you have entered the incorrect user name and password, and you have just been using the trial guides. make sure you type it exactly correct, it should say Welcome hotohorikakashi
enter your username: hotohorikakashi in the field and password correct.