Fear not working in latest build?

[Verinas]

I'm not sure if I'm posting in the right place or not but from what I've read on the forums, fear "should" have been working for a while now. In fact, the rules all in the database say it's enabled.

HOWEVER

Whenever I (necro) cast fear on a mob, it says the fear spell has worn off immediately after casting.

Is there another server setting I need to check for to enable fear to actually work? I should also note that this is the level 4 fear... I read somewhere that the level 4 fear may not work properly and the higher level ones do but I cannot yet confirm that.