QTR-Quadtone RIP

It sounds, from your description, that the QTR printer has become your default printer.
In the first printer dialog box there is a place to choose the printer you want to use. Make 
sure that your color print driver (Epson or whatever) is selected there. Then follow your 
normal printing process, remember to select either the printer or Photoshop as the color 
management source, and then make appropriate selections in the second print dialog.

David