Now admittedly I have a number of mods active, a few that overwrite a few YAML functions even, but nothing else that I have installed touched NV in any way, or adds/changes the default N key bind, and even if that were the case I've already attempted rebinding NV to a different button and the issue just follows to that new button, so I have to assume it's YAML's doing;

Basically, when I press N it activates NV on button depression and then switches to some strange half-mode on button release. Pressing it again cycles back to that first mode on depression and disables NV on release. NV also seems to bring up some semi-transparent window as opposed to simply filtering the screen which is very odd. I rarely use NV anyway so it's more of a minor annoyance than an actual issue but I'm still baffled as to what's doing that.

Edit: I've since tried launching MW5 with just YAML and Mod Options enabled and nothing else and the problem persists so it is absolutely YAML causing it. Probably.