Hello I just came back to the game today. 3 days old Windows 10 system, clean client install through Gameforge Launcher, no addon, yet quests markers are missing.
I remember the old disappearing quest markers bug used to go away when updating graphics drivers but I just updated to latest drivers (471.11 as of writing this, by the way I have a GTX 1660 Ti) a few hours ago and it does not fix the Missing Quest Markers issue.