I have a private modpack (BC, Logistic Pipes, TiCo, TC, Railcraft, TE, MFR, EnderStorage, Morph, NEI, InvTweaks, StorageDrawers, JABBA, BiblioCraft, Carpenter's Blocks, Tall Doors, fastcraft, Rejs Minimap and ThaumicTinkerer) and updated it yesterday.
Since then every time I attempt to trade...