QTR-Quadtone RIP

While I was thisclose to finishing a QTR profile (I'm making digital
negatives on Pictorico Premium OHP transparency paper for my alt process
work using Ron Reeder's excellent Digital Negatives book), the Quadtone
RIP dialog box abruptly disappeared. I'm running QTR 2.7.2 on Mac OS X
10.7.1 (Lion) on a MacBook Pro through Photoshop CS5 to an Epson 3800
printer.

Here's what normally happens. I choose Print and get the Print dialog
box. I then choose Quad3800 (i've already loaded my custom QTR profile
through QTR's  install.command) and then click on Print Settings. From
there, I get the Quad3800 print setting dialog box. I choose the popup
menu that starts with "Layout" and pick "Quadtone RIP" which then gets
me to the Quadtone RIP dialog box, etc.

Since Tuesday night, the Quadtone RIP choice in the popup menu has
disappeared. I've tried everything. I've de-installed and re-installed
QTR 2.7.2 numerous times. I've even de-installed and re-installed the
entire Adobe Creative Suite CS5. I've tracked down old .plist files from
older versions of QTR and deleted them. I've even made sure to get rid
of the .quad.gz files that are located in that ppd alias file that's
located in the user/library/printer/qtr folder before deleting the
entire qtr folder itself. In a day's worth of deleting and reinstalling,
I managed to get Quadtone RIP to show its face only to disappear once
again once I quit Photoshop before attempting to load the custom QTR
profile that I had been working on.

While I think it may be a Mac Lion problem, I'm just wondering if anyone
else has experienced this same issue, be it on Lion, Snow Leopard (10.6)
or earlier versions of OS X.

In the meantime, I'm in the midst partioning my MacBook Pro's 1TB drive
so I can load Snow Leopard, Photoshop 5 and QTR 2.7.2 so I can continue
to work until this problem is solved.

Thanks in advance for your help.