Board Thread:Questions and Answers/@comment-174.124.251.160-20130420031207/@comment-5796218-20130725154939

As Yiazzy noted, It's actually not NEIs fault, it's the latest version of Factorization added in the 0.6.5 update. FTB Ultimate has the same problem too.

Issue can be fixed by removing or downgrading Factorization (thank goodness!) Link here to an article on how to fix the problem

EDIT: Woops didn't mean to rez a million-week-old thread.