QTR-Quadtone RIP

I am using a Mac and version 2.6.2 OTR, Photoshop CS3.

Everything was running perfect, then I quit getting a choice to select the QuadTone RIP 
Dialog box when the print driver was up.  It was working well before until I modified a curve 
file I was working on and then installed it.  That is when all of my problems started.  I wasn't 
having any problems creating curve files and installing them before this point.  I tried 
restarting; I ended up deleting the two folders of QTR and reinstalled and set the printer back 
up, and reinstalled my curves that I have been working on.

Now when I get to the QuadTone RIP dialog box and I try to select a curve there is no curves 
to select from; "None" is the only choice.  Not sure why it isn't finding the curves; I'm not sure 
how to tell it where to look for the curve data. 

I was really making some headway, and on my final rounds of tweaking my curves to get the 
maximum dmax before linearization.  This is getting very frustrating.

Thanks,
Randy