Just downloaded the software and with my Kinnect Scanner, it works fine. I think I still prefer Skannect, but I was able to make a quite reasonable 3D model.

Are you selecting all the scans - 10-12 seems to work well, then hitting combine? I found you need quite a plain background and good lighting to get a consistent scan, but even a few shots of my cat asleep on the sofa seemed to work!