Thank you so much tt2.
The problem is that the Wacom Intuos driver simply does not work with my current Admin. User account.
I tried older and newest drives. Not working Several installations. Disk Utiliy repairs, etc.
Wacom support suggested a new User Admin. Account on my Mac (Mac Pro mid 2010/Mac OS Sierra 10.12.6).
I created another one Admin. Account; that I already erased, just to test and the Wacom works.
All I want now is to create a new deffinitive Admin. User Account with all my settings, prefs. hard disks, etc.
Everything ,-) and Safe.
I have a Time Machine working.
How shall I do?
Thanks.