This is not a problem as such, but different versions of PapyrusUtil overwriting each other can cause problems, varying from mods behaving erratically, game freezes and crashes to desktop.
Unofficial Enhanced Lights and FX ELFX SMIM ENB fps performance patch
Thread will be updated, when ever I remember or find out a conflict and solution for it. I am collecting solutions that might be hard to find, if you do not know what you are looking for. This post is dedicated to solvable conflicts caused by mods.