Just worked for me today!!! (from a solution I saw somewhere on these forums)
(I was WM OFF but I don t think it matters)
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Switch to Old Pandaria (Not current N’zoth version)
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Go to the gate. Stand in the middle next to the entrance from Vale (Coords 9.59)
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Dismount and make sure Uuna is not summoned already
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Logout / Exit Game
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Login and Summon Uuna.
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Enjoy the chat and hope it doesn t get stuck somewhere else.!!!