The Deadwind Site

Frost mages are getting stuck on this quest and this is the way to fix the problem. You need to get to the version of Deadwind Pass that no longer has Dalaran floating above it. In order to do that, you have to complete 3 quests. Go to the Dalaran above Broken Isles and talk to Archivist Elysiana in The Violet Citadel. She will ask:

Do you wish to hear a tale from the past, Player?

and you reply:

I want to experience the return of Magni Bronzebeard and Khadgar's adventures in Karazhan.

You receive the quest: Calling of the Council

Take the portal to Stormwind (or Orgrimmar for Horde), then take the same portal to the Dalaran over Deadwind Pass that you took for the quest In the Blink of an Eye. Talk to Khadgar outside the Violet Citadel and complete the quest. At that point Brann Bronzebeard shows up and offers you a nice little side trip to Ulduar:

The Diamond King

When you're finished in Ulduar, you take a portal to the front gate of Karazhan. At this point, if you look up, you'll still see Dalaran above you, so you're not where you want to be yet. Turn in the quest and pick up:

Hiding in the Stacks

When you finish in Karazhan, Khadgar will port you to the Dalaran above Deadwind Pass. However, when you turn in the quest, the game will reload and you will be in the Dalaran over Broken Isles. At this point, your problem is solved. Just take the portal to Karazhan in the Chamber of the Guardian. Dalaran is no longer over Deadwind Pass and the Abandoned Kirin Tor Camp is properly phased to finish The Deadwind Site quest.

Since the map is completely unhelpful, to get to the portal to Kharazan, you have to take the portal to Dalaran, then go into the center of Dalaran to the Chamber of the Guardian, and down the steps, the portal to Kharazan is on the right.

Video Guide: https://www.youtube.com/watch?v=z5Q7gWmPnZ8

1. The Deadwind Site
• Accept the quest, The Deadwind Site, from [npc=102700] at coords 58.3, 42.9 (Hall of the Guardian).
• Travel south to 57.2, 89.8, and click on the [object=251123].
• Travel to the center of [zone=7502], and step on the transporter at 49.1, 47.8.
• Go southwest, down the corridor and steps to 33, 73.
• Click the [object=246009].
• Proceed northwest to 36.0, 64.3, and click on the [object=250602].
• Head northwest to a tent at 35.0, 62.8, and click on the [object=250600].
• Go west to 34, 63, and listen to [npc=107702] speak.
• Travel north to 34.2, 59.9, and click on the [object=250611].
• Use your Teleport: Hall of the Guardian ability to transport back to your Order Hall.
• Head north, up the stairs to 58, 42.
• Turn in the quest to [npc=102700].