Yo, I don't know if this will help anyone, especially since the OP is from 2016, but if it in fact IS an Abyss ban, all you need to do is restrict access to the Mabinogi Registry Keys, Blade3575's way of stopping banned people from using Abyss is checking the registry key for "LastLoginChar", this registry key is updated as soon as you log in a character, Abyss then proceeds to check that key and close the game if you're banned.
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