QTR-Quadtone RIP

I'm using 2.6.0 with Aperture on an iMac running
Leopard.  Printing to an R1800 using the 3MK ink set.

I was running off a pile of prints last night and
everything worked fine.

Tonight I sit down to continue printing and no go...no
output.  Watching the Mac's Activity Monitor I see no
sign of life from QTR.  Odd, I say to myself.  It's
like it doesn't know QTR is there.

I go to
Applications\QuadToneRIP\Profiles\R800-R1800-3MK and
run InstallR1800-3MK.command.  The script runs and I
see that it installs the the existing list of profiles
plus the new one I made a few days ago.

Back to Aperture, but it still won't print.  When the
print dialog comes up, I can bring up the QTR dialog
and select the profile I want along with the other
print parameters...it just doesn't do anything when I
click Print for the final time to send the image to
the printer.

What am I missing?  I know it's going to be something
really simple, and I'll be embarrassed, but I'm
willing to suffer some in order to finish my print job
on time.

Thanks in advance for any assistance.

Ken