my client crash when I open a NEI recipe with your last build 1.21
on the crash log i see some error on rotarycraft by reika

complete crash log

http://pastebin.com/CrRtXQgn

Is this in SSP or SMP. This happens to me when the server and client do not have matching config files.

Single player

The problem is caused by NEI Integration (I tested with 1.0.13). At least in my install.

v13 has moved alot of recipe handling out. try v12. i ran into this with forestry as well as pams harvest. would crash client doing recipe lookup.

Currently working on a 1.10.2 version, the 1.7.10 version is not being maintained anymore, sorry.
Closing all issues not relevant for the new version.