Thanks! I can definitely add an option to limit previews to only 1 piece. I'll probably make the next piece be bigger too, which might help.
I've encountered that problem too on my EZFlash... It has something to do with the way it saves since I haven't had the same problem on other devices, but it's kinda hard to reproduce to know for sure. If I'm correct about this, it should be fixed in the next version (hopefully).