Mod crashes, modder help

[PH_Guy]

So, other day I was modding Apollo Crews, and for the first time for this reason, it crashed in the match up screen. The reason was the head.obj, but there's nothing wrong with the file, I just modified it like I always do, and I think was when I edited the eyes area. After I edited him without touching the eyes area, it worked. But thats odd, because I always edit what I want, mainly the eyes area, doesn't make sense. I moved on and finished Crews without the eyes look that I wanted. So, few minutes ago, it happened again, this time I was modding Nick Miller(TM61) using Ryder as base, it was working fine before, but I had to update him to look more accurate, but when I went to test it in game... It crashes. Just to make sure that was the problem, I injected back the older head.obj, and it worked. Does any modder know whats up with that? Does that has ever happened to you guys? Because that sucks...  Btw, I'm using 3ds Max 2011.

Edited September 13, 2016 by PH_Guy