A lot of people have issues with that program it seems. When I tried it I found that if you angled the camera even a tiny bit, it put the measurements way off. I only used it a short time and found that I would have to take the average to three pictures to get an even close read on a snake's length. To be quite honest I just went back to the old school method. One string, run it down the snake from nose to tail tip, measure the string...there you go!