When Item Loaders (Also Advanced version) refuel an Anchor Cart with ender pearls it crashes the game with a stack overflow. Especially annoying because it will of course keep crashing when you restart the world, because the cart is still on top of the Loader. You have to remove the Cart using MCEdit to fix it.

Crash report:
http://pastebin.com/KH1mNaYb

You'll see I am on the Mindcrack pack from Feed the beast. Not sure if this was fixed in a recent version, that is not in the pack yet, but I have not seen anything in the Changelogs. Sorry if I missed something.

Its fixed, been fixed for a while.