Ok try this:

https://dl.dropboxusercontent.com/u/8051911/SorcererKing-112314.zip 

In my game, he went after my cleric and killed him.  

I am sorry it is still not working .... 

Same save, same fight - yeti never ever moves, keeps attacking whoever is close to him. 

Very odd. Going to ask the obvious: You're sure you replaced it with my EXE?

So I have Zurn and the soldiers standing there taking a beating.

Now, Zurn is almost dead, so I move him 1 tile away.

Now, the Yeti runs over to Zurn and kills him rather than fighting the soldiers (which is what he would have done before).

Yea, definitely working here. Unfortunately.

I hate you all. It was better before. I was happy then..

WORKING!!!

I copied file again and now it is working ... I do not know, perhaps i overwrote before with the same file, if that's the case - sorry. 

wihout your save and walk through I wouldn't have found it. Thank you!!

Awesome that you got something like that fixed! Any chance we'll see that fix ported back to LH or even FE?

Probably LH.