OK, sorry I couldn’t be of more help to get you to your answer quicker! Someone smarter will hopefully come along soon, but in the meantime:
… have you maybe tried a newly created project (thinking maybe there’s something off in the one you’re working on)? Also, maybe scroll through the preferences to see if anything jumps out. Or, if you’ve saved a previous preference file from when things worked well, trash the current one and load that one to see if that makes a diff. (fingers crossed 