Gave resetting to factory a try, no luck. Not sure, most realdrums provide the notation as expected, but for some reason, some realdrums do not.
I think I'll report this issue to PG Music.

In this instance the style is Parana, even with a new song, just after regenerating with the leadsheet window opened, the notation can be seen flashing for a fraction of a second, to desapear after, it's like if it is there, but does not want to consolidate...

Thank you anyway for your help.

Artur