noob here. When i click on "logout" menu item in xfce (top-right corner), X serverver terminates. I can't remember what i did, but earlier, when i click on the same item GUI login screen was shown, where i could enter username and password. It was normal, expected behavior. But for now... For now i see full-screen terminal with something like "waiting for x server to shut down server terminated successfully" instead. So i can not logout and login from another account without leaving GUI.