Yeah, I've ran into that kind of situation before, a while back. What you could do to find out for sure if it's really finished converting is refresh the folder of where the converted image file is located (using Details view, of course). If you see that the filesize of the converted image is not zero size and looks about the correct size, then it's finished converting. That's when you know you can safely close out BINChunker by clicking on the X or Exit button.