I'm trying to complete "Climb Every Mountain" near Bitter Springs. I can climb up to the mountain near the Great Kahn supply cave, but am unable to get close. On looking closer, there is an invisible wall stopping me. From certain angles, I can see that there is a mountain texture suspended in the air like a sheet - it looks like this is creating an invisible wall.
Is there any way to get round this, as it is preventing me completing the quest?