Slenderman Monster

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Last thing I can think of is that you have too many joint influences per vertex. Shouldn't be a problem if you only have one joint but who knows. When smooth binding click on the options box to the right of the name and make sure max. influences is set to 1.

If that doesn't fix it I'm afraid I can't help you any further. Either your file is broken or the export plugin or your model viewer. Only thing you can do is search for the problem systematically, for example by opening a new maya file, skinning a simple cube to a joint and trying to import that. If it works the problem lies in your file, if it doesn't it's either the plugin or the model viewer...