I didn't play GW for some time now (about 2 years), and I wanted to play a few vanquish areas but I noticed that a lot of areas/missions I did in hard mode are marked with red color (which means I didn't do it in hard mode?!) instead of the golden colored helmet (which would mean I did it - as it should be). I also see that in my titles the amount of finished hard mode areas is fine. Is this a bug? Or should I talk to an NPC to 'update' my account? How do I fix this problem?
I can't seem to reproduce this at all on my account. I would try turning on Hard Mode, then zone into the areas you know you've vanquished. It's possible that it just needs to run some sort of "check" since you've been gone a while. As far as I know, there is no one single NPC you could "update" with.