Op-fire not opting

[Fierce]

Has anyone run into a problem with opfire being stuck on "never" for all hard units? I'm currently playing "Tank Graveyard at Minsk".
It worked for two turns, then I played around with the settings, setting some of my units and my HQs to never shoot at hard targets. Now I can't turn on any hard unit to shoot at a hard target. I don't want to tell my opponent because I'm doing ok but I don't know if I should restart the game.
I'm hoping its just a one time glitch.
Dave