Good day! I have the same problem. When i press "Log out" or "change user" UltraVNC shut down. It's installed as a service. I've tried to unstall different version of program. When i connect to Windows XP it's OK. How can i solve it.
Yes, if i connect it again - it's ok. But somedays i have to connect many times to diffrent computers. According to our password policy we have a very long password (not less than 8 letters) and it's not very comfortably to type the password every "Log out" or "change user". So as i realized it's a feature of connection to Windows 7 ?
It started with Vista and the implementation of secure desktop. When logging out the user session closes the UltraVNC server which disconnects you. As long as you have UltraVNC installed as a service it can relaunch the Server at the login screen.