I got a bug while using this in conjunction with my other mods. I noticed in NEI that it was showing no items at all, even though there was nothing in the search bar. I went, "That's weird..." , but continued on. I decided to press the vanilla search function and, boom: crashed. Here's my error report. Yes, you read 54 mods enabled. It may have something to do with them, but I doubt it.
EDIT: It's definitely GregTech. I used the NEI interface to move to the bar which said GregTech Intergalactical in the minecraft creative interface, and boom! Crashed again.
Steps for me to duplicate:
1. Start world in creative mode
2. Open inventory
3. Press the search button