As well, here is a quote from an Oct. 15 post from Wick:
[Wickham Strub] “Version 13 does NOT solve the Quicktime 7.5.5 problem.
If you want/need to use the Media 100 i codec or the Motion JPEG B codec then you’ll have to stay on QT 7.5.
If you want/need to use QT 7.5.5 then you’ll have to stay away from the Media 100 i codec and the Motion JPEG B codec.
“
Let us know how things work out for you.
Gary
This is me – this is what I do – https://web.mac.com/garymmw