Clapton is God!
And in this case:
rolfy is God!
After he explained to me the difference between 25fps and 30fps
he also showed me that the max-file is o.k. and can be exported with the panda-exporter.
In the meantime, after getting different results with the same files and software configurations on two computers, I tested it on a third machine, and -simsalabim- the export from max was fine!
It seems that I have to reinstall max on the other two computers...
[EDIT] It was the Panda Exporter that caused all these problems. See one of the following posts [/EDIT]
Now I can move on and fine-tune the model.
THANK YOU ROLFY!