I found out that wearing a solar helmet that charges a Jetpack/Batpack/Lappack (one of these mustn't be full) will crash minecraft if you look at a recipe which first opens up a smelting/macerator/extractor/compressor tab.
e.x Pressing the recipe button when hovering over an Iron Ingot will crash the game.
Pressing the use/recipe button on a semi-filled CF Sprayer will crash (not tested with full/empty).
It will also bug the recipe view if you press the recipe button over an Iridium Plate (it will show one of the packs named above, usually in the top right space).
Now, I'm not sure if this is due to an error with NEI or IC2.