I'm not sure what you mean by "becomes unresponsive". Does releasing left Ctrl make the GDI+ window disappear again or can you simply not click any more boxes? What version of Windows are you running? I mean that nothing happens after I click one time. For example, if I click once on a color, the keys will all turn that color. But if I click on the key I want to place in a box, nothing happens. The box with the key I select doesn't highlight or anything. Or if I click on a key, it'll highlight the box with the key. Then when I try to click on a box on the map the key wont be placed in the box if I click on it. Running Windows Vista.