Board Thread:Questions and Answers/@comment-41.133.32.2-20131002163809/@comment-1757231-20131003142258

Well my friend, some proffesional hosts auto-reload deleted files to make sure griefers don't mess with them. This "gamemode hack" can be changed in the NEI.cfg file, to turn off that option completely. If you really want to remove NEI, simply copy-paste everything in your server, and start a new "Vanilla" Server, and copy all your files excluding NEI, it should load properly. Hope this helps!