Thanks for the advice, everything worked properly with validly gained items.
Ah ok. I had cheated the items to myself. I'll give that a try then.
Playing on my personal server using 1.8.1 I'm unable to craft an MFE unit, also meaning I can't craft the MFSU. Is this an SMP problem or is anyone experiencing this in SSP also? Are there any workarounds? I also haven't tried crafting the MFE with charged energy crystals, does that make a difference?
Edit: I've tried putting an energy crystal in a batbox to charge it but nothing happens.