Here's an Uldum with a dxDiag
I have this problem, and it is repeatable, on all my toons in Uldum. The problem goes away with the viewport disabled.
Alliance toons, Shandris server. This particular case occurs at 54.97, 36.11 but it happens anywhere near the dam. This particular toon is a Worgen Priest names Katicia
I've also attached a dxdiag so you can see what my system is
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