QTR-Quadtone RIP

Hi, 

I have just installed QTR version 2.5.1 under Mac OS X 10.4.9.  I have an Epson R2400 and 
was able to get quite a nice first B&W print right out of the box.

Now I have the following interference problem with other printers.  Besides my Epson 
desktop, I have installed a number of Postscript printers that I use in the office (HP, Lanier 
and Xerox).  I have noticed that the QuadTone RIP menu entry not only appears in the 
printing dialog box when the QuadR2400 is selected, but also with some, but not all, other 
printers (a HP color printer and the Xerox).  I think should not be the case, since during 
the installation process I had to choose the printer which I want to use with QTR, so I 
would expect that the others should not be affected.

With the HP I have at least a choice of 'On' and 'Off' in the mode menu of the QuadTone RIP  
dialog box (where you normally chose between printing and calibration mode), but the  
Xerox just offers 'Gray' as the only choice and now behaves incorrectly on Postscript files, 
which is annoying. Both of these are network printers using the IPP protocol.

I would like to get rid of the menu entry QuadTone RIP for all but the QuadR2400 printer.  
I also tried to uninstall the program using Remove-QTR.pkg, but the installer keeps saying 
that there is nothing to uninstall.  

Do I have to completely reset my printing system and lose all configurations, settings etc?  
Any ideas to avoid this would be greatly appreciated.

Best wishes, 
Christoph