QTR-Quadtone RIP

I am using a Mac G5 and Epson Stylus R2400 inkjet printer.  I have been printing all of my 
black & white work via the QTR RIP.  When I print color I use various paper profiles.  
Everything had been going quite well until I loaded Apple's latest operating system OS X 
v10.5 Leopard. I wish I had not done so before doing some research.  (please bare with me as 
my question is coming) 
  After loading the new Mac system I tried doing some prints and found that the final print 
dialog box was much different than the previous version and that my color prints came out 
looking awful. I then found out that Epson had a new download for Leopard compatibility 
issues so I installed that.  Things were looking better as the last print dialog box looked more 
familiar.  When I decided to hit the final print button for producing the same color image 
(NOT using the QTR RIP) a warning window appeared saying: "no QuadToneRIP curves 
specified.  Print quality is not assured."  I had not even chosen the QTR RIP.  I cannot seem to 
disable it.  The print again comes out looking awful.  How can I remedy this?  Any help would 
be greatly appreciated as I am a professional photographer and this is making life kind of 
difficult. 

Thanks in advance!