Taking Pictures with a Nikon D80, only takes black pictures.

Hello guys,
I connected My Camera (Nikon D80) in PTP Mode.
The software itself recognizes the camera and when I open a new Project
it tells me that there is no live Preview available and that i need to press the
“Preview button”. When I do this the screen keeps black (where the preview is shown),
and when i take a picture it is black.
Any ideas why this happens?

Does the capture process works if you are using the “Image Capture” app by Apple?

It works with the “image capture” and also With the isight camera.

Which version of MacOS-X are you using? And which version of iStopMotion?