Thanks for the great response guys!
It has been brought to my attention of a couple of bugs relating to the window not responding to being closed and I also found a bug where the program won't display an image if it matches the initial window size of 320x256. These have now been fixed so I should be releasing an updated version in a few days time. As for your problem adolescent, I'm not really sure. Clearly it's an OpenGL related problem. Are you running the program on software drivers or do you have a graphics card installed. I think the program works at it's best with a graphics card installed.