QTR-Quadtone RIP

joel,
I have had that happen to me a couple of times.
The reason seemed to be that I had forgotten to quit Photoshop.

So, the procedure I developed is:
take the text file for the curve and put it into the profile folder.
Make sure that Photoshop and the QTR printer are closed (i.e. no blue dot under them in the 
dock.) Not sure how scientific but that's how I confirm it. 

click on install script for the printer in the profile folder.

confirm that it "installed" the curve in the text log for the terminal session that is started by 
the install script.

reopen Photoshop, select a file, go to the print dialog, click on QTR, select the preset for the 
paper and check to confirm the curve is there.

This has always worked for me, providing that Photoshop is quit when I run the install script.

David