Safedisc 2....again!!!

I want to say what happened to me with this protection...few weeks ago I've prefectly backed-up GP3 Addon 2000 (safedisc 2 protection) with my plex 1210A (firmware 1.05) and Discjuggler last version (!!!) and it works fine in all CD-readers I've tried; then I've tried to copy Commandos 2 that uses the same protection with the same settings I've used before and....nothing!!! I had to use the crack to run the game...Can anyone help me to explain this? Many thanks in advance.

Robaerus