When I mouse over Vekax (the skettis who wanders around in Shattrath), my cursor disappears just when it's on him. The cursor comes back when I move it off of him. This does not happen with other NPCs I've encountered. I was using a freshly cleared/defaulted UI with no settings changed.

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You may be big, but I'm small!

Thanks for the report Graymalk. We're looking into this issue.