I just released VueScan 7.1.2 for Windows, Mac OS 8/9/X and Linux.
It can be downloaded from:
http://www.hamrick.com/vsm.html
What's new in version 7.1.2
* Improved color and tone when scanning negatives
I'm pretty sure this fixes a lot of the problems people have
been seeing with negative scans looking flat or dull. You'll
probably still need to experiment with "Color|Gamma" and
"Color|White point (%)" or to do some Photoshop manipulation,
but it should be a lot better.
Regards,
Ed Hamrick