Here is a tip on calibration, let the scanner run with the projector on for a while so it warms up before you calibrate. I have found the accuracy is better if you do.

Also, be very careful when you scan that you watch your video card memory. I downloaded "Techpowerup GPU-Z" to monitor this. If you try to manually align or delete a scan, that "align" screen will instantly double your video memory usage. The moment you exceed your video card memory limit, the software crashes.

If you are over half your video memory used and you get a bad alignment, do not try to delete a scan or align. Just finish and save otherwise you will lose everything.

So if you are scanning larger objects like I am, you will need at least a 4GB video card. The more you have, the better.