I just downloaded a trial version of istopmotion for my macbook. I use a Nikon D80 DSLR camera. I change the USB memory to PTP to allow the program to see the camera, but instead it does not come up as a source. It only see the built in isight. I don't think I'm doing anything wrong, but does anyone know of anything else I could try? I emailed the company and they gave me a suggestion, but it didn't work. Any help is much appreciated!