I think i found one of the spell crashing issues directly related to this, it's a new level 100 ranger spell that I have that procs an effect upon an NPC's death..
http://raidaddicts.org/Allakhazam/sp...&action=search
So it may be that the spell effect "(360) Proc on Kill Shot" is something that is crashing the zones and is not implemented on eqemu yet.