Well reinstalling would probably fix it, but someone could probably send you their Skill.wz file and save you the trouble. I was about to, but I can't upload at the moment, sorry about that.
Alright, so I currently share a computer with my younger brother, who also plays maple, and he downloaded the Modded skill.wz files in order to use the infamous "Familiar hack" and honestly speaking, I don't like having that on my computer. Does anyone know where I can find the original skill.wz files to replace them? Or should I just download the installer and re-install it?
Here you go.
http://www.mediafire.com/?at4pop4bt8b2r8x
Unmodified original skill.wz for v1.4
Kick your brother's ass for me too.
Butts.
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There should always be a Manual Patch Thread on the Nexon Maple forums where someone uploads all the files so others can manually download and upload them.
So if you ever need some clean files and we're not available, I suggest looking there.
by Cryopon