Hate to bump this but there was a problem with Polaris' Chain Lightning that I have found, and since it was extremely frustrating to me to fix, I thought I'd share.
If you pay attention, the FIRST chain does not cause any damage, just shoots throught the enemy/object, then the second, third, etc chains cause all the damage. Using your XMLBCUI, open Polaris' powerstyle and find the Chain Lightning. There are two effect entries there. One is using Magneto's P8 power, the other further down using Polaris' P4 power. DELETE THE POLARIS TRIGGER.
It should be inbetween Trigger Lightning Data and Trigger Bip01 R Hand entries. Just Ctrl X that out, save the file and compile and it should work after that.
As always, copy the folder first and back it up, then run the game to see if you get the same effect as me.
Again, I'm sorry for bumping an ancient thread, but when I was reinstalling the game and mods, I forgot about this one little flaw in an otherwise immaculate mod. Hope I helped!