[trevius]

Also, there are a few fear related rules, which if not enabled or set correctly, can cause fear not to work at all. Here are the default values from ruletypes.h:

RULE_BOOL ( Combat, EnableFearPathing, true)
RULE_INT ( Combat, FleeHPRatio, 25)
RULE_BOOL ( Combat, FleeIfNotAlone, false)

If you have EnableFearPathing set to false, mobs won't fear path, and if you have FleeHPRatio set too low, they won't fear path either.

Edit: On second thought, even though fleeing does use fear pathing, it doesn't have anything to do with actual fear spells. Only the EnableFearPathing rule would effect that.