Flex Pitch Showing Every Pitch as C0

Hello All,

I have a new problem with Flex Pitch. I am mixing some marching band demo tracks. I typically just globally turn on Flex Pitch and set every instrument to perfect pitch and this has always worked great. Every instrument is discreetly recorded with very minimal bleed. All of the sudden now Flex Pitch will work on some of the tracks, but others it just shows every note as C0. Furthermore, if I go ahead and "Set all to perfect pitch" these messed up ones sound horrible with all kinds of beats and distortion in the sound. My assumption is that this is a processing issue from me trying to run Flex Pitch on 30 tracks at once. Perhaps I should do one track at a time instead. That being said, how do I reset Flex Pitch enough that it will RESCAN the track and hopefully correct this mistake. Simply selecting "Reset All" on the track of course doesn't reset the original scan. TIA!