My advice is to turn off URL rewriting.
1. vBulletin doesn't need it: all of the major search engines can spider and index the out-of-the-box vBulletin URLs without any modification at all
2. it won't help you with a vBulletin forum, notwithstanding popular clamorings to the contrary
3. it does add somewhat to server load - save that for features that actually matter and enhance your forum
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