Summary of the problem TileEntityFluidInterface form Extra Cells causing server crashes Pack Version 2.6.0 What is the bug? When removing a thermal expansion fluiduct while full with a fluid down a line of fluiducts connected to a ME Fluid Interface in block form (not the multipart) on the other end will cause a server crash and make the world unplayable until the tile entity is removed before starting up the server. The fluid the duct was full of was mob essence from Minefactory. The side the duct was extracting from was the west side of the interface. Hardened fluiducts with a basic servo. Mod & Version ExtraCells-1.7.10-2.3.14b197 Link to log file http://paste.feed-the-beast.com/view/b4b24f62 Is it repeatable? Yes - Both multiplayer and singleplayer. Can be repeated by setting up a basic ME system with a fluid interface and extracting a fluid from it while removing a full fluiduct connected. Known Fix - Setting "B:removeErroringTileEntities" to true in the forge.cfg file will remove the tile entity, making the world playable again. - Removing the interface before removing the fluiducts then replacing later.