After this topic the system recognize my posts as spam and they can't be visualized, perhaps due to a without-reason intervention of a not-very-moderate-mod.
So I write here the answer to the question of namgostar to this topic, hoping that in the future this problem will be solved.
Reply to namgostar question:
No, what I said about starting over again only applies if one does SEO with the theme.
Changing the theme doesn't affect the SEO plugin settings at all.