I encountered this issue as well; fortunately the fix is relatively simple.Mod Pack: Monster 1.1.0
Mod & Version: NotEnoughItems 1.6.1.9
Pastebin link to crash log: N/A
Whats the bug?: NEI wont change from cheat mode to utility mode to recipe mode. it stays as the mode it was when the world is created. eg create a creative world and it will be stuck on cheat mode.
Can it be repeated?: Yes
Known Fix: Unknown
1. Click Options in the bottom left corner and then click on inventory.
2. Click on "World" in the top right and you should get several "W" icons next to each setting.
3. You should see that the "W" for the mode setting is selected, left-click on it to un-select it.
4. You should now be able to change modes