I updated and had problems.
Soundtracks in FCP won’t run, FCP crashed, I had to go over Soundtrack pro to solve the problem, Flip for Mac won’t take FCP files because of the sound problem, I had to reinstall Flip for Mac again.
So there have been some issues.
Now it runs fine.
And I did no beginner mistakes such as prefs, or renew the HD register .
Rainer