they're 'hidden' in the cockpit.sfs files
personally i'm guessing somehow one of the .mat files is corrupted- you could test which one(s) by commenting out each file individually and seeing which one 'fixes' the problem - that'll take some time tho

i'd be slightly more concerned that it COULD be a sign of a failing hard drive- might be a good time to back up data- just in case

it could also be 'one of those things'
anyway glad you're up and flying
