I use project EX 1.2.0.39 in 2 of my private mod packs and both hangup at loading the world, the problem resolves when removing the mod.

I don't have a crash report because the game does not crash it just freezes when trying to load a world.

I don't know why, but it seems like when projectEX loads too many items with EMC will cause this(Maybe try to delete \config\ProjectE\custom_emc.json or "Expanded Equivalence")