Did you turn the projector on? It will calibrate without the projector on, but it will not scan.

When it is scanning can you see the fringe pattern on the part as it scans? If you are getting no data and your projector is on, you likely have a very dark or very shiny part and no data can be taken from it. Don't forget to set the brightness level of your part at the beginning.

Here is a fun fact for everyone that is not obvious:

If the part you are scanning is very bright and causes the bright red regions on your preview screen, just sit and leave it like that and don't scan. Just wait. As it sits it will start to very slowly auto adjust until that red region disappears. Pretty cool eh?

Regards,
Dave @ NERV