i get 2 pointers or arrows for the quest, both exactly opposite each other, for example, if I have a pointer directly north for a quest, i also have 1 that's directly south.
Naturally this makes completing any quest crazy, I followed one earlier all the way to the edge of the map, it was still pointing outside the map and had another pointer 180 degrees behind me.
Tried relogging, restarting client.
I have the latest Java, as for my graphic card, this is not a graphic bug. I'm using the default client at the moment but i usually play with Pasta but it's not up to date yet

Thank you.
Update : Also occurs in Pasta

Update 2 : I found that zooming far out and then looking straight down will show only 1 pointer, at least a workaround that let you know the real direction for the quest.