You’re welcome, Leo! :o)
BTW, I tested again, and a new scene as well, R16 fails, R17 and R18 works.
To be more complete, I created a scene in R16, even if it didn’t work there, and opened it in R17 and R18: both cases—it worked.
The other way around, creating a little scene in R18 and open it in R17 with success, but in R16 not at all.
In all cases, the Pose Morph worked.
I used the Script 1.02/2015 every time on Mac OS X.11.6.
Opening the script in R16 on a Mac OS X.10.5—just to check, same result.
In R17.032
Change of Python Version
The version of Python integrated in Cinema 4D moves from 2.6.4 to 2.7.9