Ok... now, after a lot of tests.... At windows settings, network settings, there is this " network reset" When I press that, I can start a new show normally!! But this procedure requires to restart the PC. After the restart I cant start new show!!! But the show that was created between, network reset and restarting the PC, opens normally!!!!! Now what about that?
That sounds like you have something on your network preventing you from creating a new show file. Show creation pulls more resources than opening a show. If you only are using WiFi, try creating a show disconnected from WiFi; if connected to a network via Ethernet, disconnect the ethernet cable and try creating the show.