Hi Bruno,
Curiously the was solved alone.
First, no, the port 8000 is not in use and the URL is correct. I verify TMSHttpConfig.exe and this URL is in the list (implicit with * and explicit because i add the full URL in the list to force it).
I use the TWebButton in order to test the problem, but every new project with only one TWebButton or other component runs fine except my existing project.
But today when i try it all runs fine, my project too.
Is clear that the origin of the problem is in my user session of Terminal Server. Perhaps related of permissions...
Well. The problem is solved...
Thanks !!!