FCP 10.6.8 freezing on MacOS 12.6.8

Hello, all! I am using FCP 10.6.8 on a Late 2013 Mac Pro running macOS 12.6.8 and until I upgraded to this OS, everything was fine. Now, FCP hangs up at the slightest action. Just now, it hung up when selecting a file to import. I finally had to Force quit and on restart, it's been almost three minutes and has not brought up my FCP work space yet. I have consolidated files for my projects, but no action. It MAY come up eventually, but I don't have time to sit here and watch it? Anything I should be looking into here? Thanks in advance!

Geo. Willeman