QTR-Quadtone RIP

I'm just going to post my email to Roy, in case someone has run into this.
Hi Roy-
Since we traded these emails a while back I've been keeping an eye on your site, looking for a new version.  I saw 2.7.2.0 last week and went ahead and downloaded, updating an older version I never used.  I installed the QTR driver for my 9600 and the 11880, so far I've only played around with the 96, haven't jumped in with the big one yet.  
I noticed a strange thing today and I'm wondering if it's related to QTR.  Most of my color printing is done on a PC ripstation, though for certain applications I print directly out of photoshop on the mac (I'm running 10.5.8 by the way).  I went to do that today (as far as I know I haven't printed on the mac since updating QTR), and I got one strange looking print!  It looks like the printer laid down horizontal black lines (about 1/16" apart, composed of all inks, not just black) and then printed the image normally on top of that.  The lines span the entire width of the paper, not just the actual image area.  I tried both CS3 & 4 with the same result.  I removed the QTR 11880 driver, and re-added the normal 11880 in sys prefs all to no avail.  The only thing I did not do was remove the new version of QTR.  Prints coming out of the RIP look totally normal, so it's definitely something on the mac causing the problem.
Have you run into anything like this?  Does it sound like it's related to the new version of QTR?

Thanks for any advice!

Cheers~
Eric