On Mac 10,15,7 and R23,110
After installing the Cycles 541 update, first rendering with a very impressive time saving for equal quality ....
BUT after a forced stop, with a flying window of the "timeline"
Then impossible to restart C4D without having a Crash on startup.
Complete installation of the application without deleting all the C4d files in the Library folder where the application preferences are found. So always I still had the problem and could not open C4D.
Finally after removing all Maxon files and re-installing with version 509.
While waiting for the end of the renderings of my current projects .... to try version 541 again.
I do not know if it is a problem of C4D or Cycles4D 541 ....
But with a reading impossible to stop, for lack of power, the forced stop is the only solution that I know ...