Trying to use the Spirit Furnace with a Box of Eternal Closure containing a third-party mob mod crashes the console and sends you back to the launcher. Placing the Box of Eternal Closure with their contained Vengeance Spirit in it is fine, but if any blood is in the machine and it tries to process them it crashes and will keep crashing on returning to the world. I'm using the ATL launcher for this.

Source: http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/wip-mods/1445975-evilcraft-open-source-v0-9-2?comment=491

trying to use the Spirit Furnace with them crashes the console and sends you back to the launcher.
Them? Define "them" please.

(Updated the comment)
It was just copied from a comment on MCF :-)

Hmm, you're right, I should start doing that.

Ah, that's better. Also might desire to provide the reference link since it's not exactly your post originally.

Crash log: http://paste.atlauncher.com/view/e92150ac