Some people have reported issues with fullscreen mode on Windows. For now I have switched it off until I can solve the problem, which is not easy due to the limited resolution management options in the game engine RFB is built in. If you launch RFB and cannot see the title bar at the top or tab bar at the bottom, try resizing the window until they are visible, and likewise for the sidebar. If your monitor has a fairly low resolution and playing in windowed mode makes text too small to read , there is a 'large text' option in settings. If you still experience issues, please post in the forums with some screenshots and details of your screen resolution, monitor etc.