he is using the Mac version, it is a Mac Carrara bug I believe,
try the C8.5 beta but do not rely on it as you cannot continue your project if the temp serial runs out and they do not renew it.
might be ok just to do your f4 animation in.
Seriously, the bug issues are probably more to do with DAZ, not coding correctly. Admittedly Apple could do more to help developers when it releases game changing code such as the most recent updates. But then again, Apple hasn’t made a PPC based Mac in years, so why keep supporting the legacy code?