No I'm not from Molten...Our whole Server calls "Frostwolf" not only the realm. (because we're playing on this realm on the officials, too and like that name) :3
I cleared my cache and yes gm's can buy from the vendor with no problems but player's should be able, too. :/
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My next idea is to remove all items from this vendor and left one in it...then I'll try again. Maybe the're too much items in it?
I'll report later when I'm done testing.