Situation:
im running multimc on my own and my wifes computer. she ripped my folder over the network so we have identical everything.(Folder is on his computer)

WIN 7
MultiMC 32

No problem on vanilla on multiMC or tekkit and normal installation of minecraft

Problem:
On her computer everything is fine but mine minecraft will flash blue as I walk and randomly go transparent.
it just flashes blue and whole sections of the world will go transparent

Mods:
Modloader, optifine A7, forge, code chicken core, not enough items, BC, IC2, forestry, extra biomes, invtweaks, iron chest, mystcraft, railcraft, reiminimaps, stevescarts