Thanks again Osiris. I reinstalled old version (in orden to start-up the program) and then I installed again the 9.6.13.405512 pack. At the moment, no problem.
I will follow your advice. The problem is the 9.6.13.405512 pack don't have any skin. I'm using an old one.
It is the same thing -to avoid future problems- if I change the "scheme"?? (a simple one, for example, "Easy-Day"/"Easy-Night")
Thanks.