Are you using a mac? If so, you may need to hold down the fn key to use the F keys as standard F keys rather than their specialized functions (i.e. iTunes control, volume/brightness, etc). There's also an option in system preferences to swap F key behavior (operate normally as standard F keys, fn gives specialized functions).
If you're not on a mac, remember that NEI keybinds are their own thing - you won't find them in the normal keybind menu. NEI options are accessed from your inventory screen (or any screen that shows you NEI) - the button is in the bottom left. Double check that your keybinds are set properly.
If neither of those solutions work, try binding something else to F7. It's possible something is wrong with the key. At the very least, you'll be able to diagnose a keybinding conflict.
Thanks for answering. I'm playing on PC.
I checked every keybinding in the controls menu and I can't find anything using F7. So I changed to other keys that wasn't used anyway. None will work. The NEI.cfg show up the proper setting each time I change the keybinding ("moboverlay=65" for F7 for instance).
I checked if my F7 key was ok by binding it to another NEI shortcut. I put it on Highlight tooltip (not the WAILA tooltip but the NEI one). And it works.
What's interesting is that the "chunk boundaries overlay" feature won't work either, no matter it's keyding.
Couldn't it be a graphic setting, maybe optifine related, or something I could have disabled on my graphic card ? I know I disabled "Threaded optimisation" for javaw.exe from Nvidia control panel to prevent an Optifine graphic glitch I had.
[EDIT] So I read here that it could be related to Modular Power Suits, gonan try to update it. [EDIT 2] Updating Modular Power Suits to 1.6.4 (it was on 1.6.2 for whatever reason) didn't change anything. Think it's related to a graphic setting.
Another solution could be to disable shaders (in my Nvidia Control panel ? No). But I can't find this setting, in Nvidia control panel.
EDIT : This solution is to disable the shaders from Modular Power Suits settings (powersuits.cfg located in "minecraft\config\machinemuse"). But mine was already set on "false". Source
EDIT : Fixed (kinda) : I disabled Optifine and guess what? It works! I already tried every version of Optifine and every one pf them has an issue or another (graphic glitches). I have a pretty descent rig so no lag for me. But I still wanna benefit from the graphic enhancement Optifine provides.
Does anyone knows what setting/bug of Optifine could prevent NEI mob and chunck overlays to be displayed ?
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