I was playing this mod in a modpack that has essence furnaces disabled but essence seed reprocessors enabled and when I tried to use the Ultimate Reprocessor ie fuel the reprocessor the internal server crashed. After much work to figure out what went wrong I noticed that at the location (blakebr0.mysticalagriculture\tileentity\ModTileEntities.class) that there was a line of code that required the Ultimate Furnace to be enabled for the Ultimate Reprocessor to function meaning that although it could be obtained in game , if Ultimate Furnace was disabled then by trying to use the interface of the Ultimate Furnace it would crash. So I'd suggest adding a separate disable method for the Ultimate Reprocessor. By the way I don't know if i'm reporting this properly I just made this github account so I could report this seeing as there were no other reports on this.