Strange, can you post a copy of the paths you're registering? When it checks a path, it looks back into the stack to see if the node isn't already in there. With a bigger data set, it would often recheck paths again when going back up the stack. You can try setting the maxcost to limit how far it runs away with this.
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WoWInterface AddOns
"All I want is a pretty girl, a decent meal, and the right to shoot lightning at fools."
-Anders (Dragon Age: Origins - Awakening)
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