I'm not sure what you expect us to do. Your task is pretty simple. Put in mods one by one with it, and watch when it freaks out. It's unlikely anyone will know unless they ran into that exact same combination. Overall if you're hoping for this scenario, you'll have better chance here:
Normally I would set up objectives and add Teams and stuff.
But Whenever I exit a save it wont save anything that has to do with the scoreboard command.
I'm sure its one of the mods cause I've tested it in Vanilla and with Forge Installed with no mods
Mods Include:
All-U-Want 2.1
Animal Bikes
Better Sprinting mod
Custom NPCs
Dragon Mounts
Mo Creatures
JourneyMap
JAS
Level Up
LycanitesMobsComplete
Mantle
Natura
MPM 2
ingame-NBTEdit
PlayerAPI
Primitive Mobs
http://forums.bukkit.org/forums/plugin-help-development-requests.91/
So just curious.
EDIT: The Problem Seems to be caused by Optifine.