Re-installing PN Extra Options apparently did the trick. My FOMM mods must've all had a brain fart. EDIT: I deleted everything and I'm installing everything from scratch to make sure I have everything correctly installed and set-up. I stopped at the end of the first half of the UI section and ran the game, as the guide suggests. I tried to untick those options in aHUD and I couldn't. So far the behaviour has been pretty consistent; disabling Project Nevada fixes the issue.