Help! I somehow crashed NEI by dying!
It may have something to do with heart canisters.
I'll...start by backing up. Before I died, among other assorted armors, I had two red heart canisters equipped. (I've experienced issues with retrieving them after death in the past, but never in a way that affected anything other than some or all of the canisters disappearing.) Additionally, I had searched 'pist' to find the piston recipe and so there were three items showing: a piston, a sticky piston, and a Witch Hunter Pistol Crossbow.
After I died, I went and picked things up, noting that both heart canisters had disappeared. That didn't worry me; I've come to accept losing canisters as a potential consequence to death by now.
What is a problem is that I can no longer use the search function of NEI. I can click through recipes/use 'R' and 'U' to hop from recipe to recipe, but no matter what I type, it won't change from my three 'pist' results. I poked through settings for a bit in-game to see if anything changed, but it didn't, so I returned to the original settings. Any advice that isn't starting a new world? Having to pop over to a browser to figure out how to make things is not particularly feasible since my internet is quite slow.