Just finished HH with no major bugs and no crashes (lucky me) but I did come across a minor bug that is just a bit irritating and not necessarily a game breaker.
When you first enter Zion there are loads of new location points (the clear triangles) on the compass, most of them work as intended but some will randomly vanish as I try to go to the undiscovered location, for example if I were at Red Rapids Docks then there should be a compass marker showing that there is an undiscovered location to the NW which would be the The Red Gate, the clear triangle never shows up or does show up but I have to be very far away, if I then start trying to follow the clear triangle it will dissappear.
So in short, some clear triangles on the compass will randomly dissappear the closer you get to the undiscovered location, I've tested to see if they are simply overlapping with discovered location (full triangles covering up the clear triangle) but that doesn't seem to be the case.

Hope this can get fixed.

Forgot to add. I don't use mods and I'm on Windows XP SP3

I'm having the exact same problem. I also noticed that when the empty pointer disappears a filled in one pops onto the compass at the exact same moment.

Ha.

I know the triangles change from clear to full when you discover a location, my point is the clear triangles will disappears when I try to get close even when I am no where near where the location is.
For example, what should happen is you follow a clear triange all the way to the location then it turns into a full triangle as a discovered location, whats happening here is the clear triangle will disappear before I can even get to the undiscovered location.

Just found another 3 locations that wouldn't show a clear triangle while trying to find them.

Locations that are bugged

The Aerie
The Spine
Sun Sentinels (Thanks Ahillamon)
Dagger's Point
Burial Mounds (Thanks trhfdgbdf)
The Red Gate


Please post if you find anymore.

I also had this bug in the aforementioned locations (plus Sun Sentinels). I added a player marker to where I anticipated the location to be as a small workaround, but the bug was still a bit annoying. Hopefully it will be addressed in the next patch.

Just confirmed Sun Sentinels.

Looked up on fallout wikia where it is on the map, walked to where it should be then I found it, no clear triangle appeared on the way to the location.
I'll update the list.

I wasn't joking, I meant that a filled triangle pops up somewhere else on the compass when the empty one disappears.

I first noticed the problem at the tribal burial mounds.

Sorry trhfdgbdf, I thought you were taking the piss. This is why I hate text based communication

I'll go and check to see if Burial Mounds is having the same problem.

Confimed bug at Burial mounds. Updating list.