The giant green arrow shows up on my PC, yes. It’s the result of my farming shards instead of heading toward the tower. It acts as a persistent nag to head over to the tower and it’s always the first tower of the four it does it with.
The arrow is an overlay on the main screen and obscures mobs and a big part of the upper right corner of the screen, including the minimap.
I did mention there’s two ways to open the full map. One is by pressing the ‘M’ key and the other is to simply click the mouse on the minimap. Either of these will give a precise location of the tower and so the ‘idiot’ arrow isn’t particulary wanted nor needed.