I have connected Chest -> Item Conduit -> refined relocation pipes -> cesu
and then put a battery into the chest and server crash.
I tested it in singleplayer:
Chest -> item conduit -> refined relocation pipes -> chest -> works without problem
Chest -> item conduit -> refined relocation pipes -> cesu -> crash

The world is not loading at all, and is crashing everytime, until i removed the offedning RR pipes.

Crash log: http://pastebin.com/XJQVJVEg