QTR-Quadtone RIP

Hi all,

It's been awhile since I posted (or printed regulary for that matter). But, I'm trying to get 
back into working with QTR and my prints again. So, I installed the latest version of QTR 
(2.5) and everything is working great. I was excited to see the option for Split-Tone Curve 
Blending but after experimenting for a little bit, I have yet to figure out how to select a 
third curve. 

Quick overview of my system. Mac G5 running latest version of Tiger. Printing to Epson 
7600 & 1280 using custom curves and profiles for custom variations of MIS UT inks on 
various papers.

After setting up the image to print in PS CS2, in the QTR pulldown of the print dialog, I get 
the following,

Curve 1: none
Curve 2: none
Curve 3: -Default-

I am able to select the curves for the first two and set the split tone sliders for them, but 
when I click on the drop-down for Curve 3, there are no options for selection.

If anyone knows that I'm doing something wrong or has an idea how I can select a third 
curve I would greatly appreciate the help.

Thanks in advance,

Eric Ashworth