Summary of the problem Many recipes only use uncraftable IC2 Iridium Reinforced Plates Pack Version 1.2.1 What is the bug? Recipes like: the QuantumSuit, Iridium Drill, Iridium Neutron Reflector, Hybrid Solar Panels (IC2), the Cooling Core, Vajra Core, Ultimate Lappack, Superconductor Cover (Gravitation Suite) and the Sunnarium Alloy (Advanced Solar Panels) only use the IC2 Iridium Reinforced Plates and are therefore uncraftable. There might be more but these are all that I could find. Mod & Version IndustrialCraft 2 Gravitation Suite Advanced Solar Panels Thermal Foundation Link to log file Not relevant I assume Is it repeatable? Searching for the recipes of one of the items described above in the NEI shows the issue immediately. Known Fix I assume the Thermal Foundation Iridium Plates are supposed to be the replacement ones.