I am doing something wrong because I can scan with another application that is unregistered but I can't scan with software that I've paid for.

This is what I am getting with ViewScan:

Scan-120301-0001 by CameraMan65, on Flickr

And this is the same negative but scanned with another unregistered product:

Tracks by CameraMan65, on Flickr

Obviously I am doing something wrong with VueScan. Any help?