Final Cut Pro X has not worked well since latest update of Ventura and Final Cut Pro. Please help

Start with this of M1 or M2 Mac...

Start up a Mac with Apple silicon in safe mode

On your Mac, choose Apple menu  > Shut Down.

After your Mac shuts down, wait 10 seconds.

Press and hold the power button on your Mac until the startup options window appears showing available startup disks and Options.

Select a startup disk.

Press and hold the Shift key, click Continue in Safe Mode, then release the Shift key.

To leave safe mode, restart your Mac normally, without pressing and holding any keys during startup.

Start with this if IntelMac...

Safe Boot, (holding Shift key down at startup), does the problem occur in Safe Mode? Could take 10 minutes or more.

Safe mode attempts to repair Disks & clears lots of caches & loads safe Drivers, & prevents loading of 3rd party extensions, so if Safe Mode works try again in regular boot.

I have a MacStudio and an M1 MBP that I updated to Ventura and subsequently, the new ver of FCP. Since updating FCP output is pixilated and jumpy. I process a lot of video and neither machine had this issue before the update. When the same video is processed on a machine that wasn't updated, it outputs just fine.

Update on this -

On an Intel (i7) Mac running Ventura and latest FCP, there are no issues, even when using the same library as the M1 machines.

I was on with Apple Support last night and they are completely baffled. Ticket opened.

crashes opening the app

Not worked well in which exact way?