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It must be an unsuitable weapon for the particular thief class you're using. Some classes can backstab with a longsword, but perhaps a two handed weapon may be out of bounds for any class. There are various restrictions as pertains to each class (i.e., xxxx-thief.) For example, I noticed the other day when testing a fighter-thief I'm using in an MP campain that I was able to successfully backstab with an enchanted scrimitar but could not do so with a plain scrimitar.
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