QTR-Quadtone RIP

Sorry if this subject has already been brought forth here before. I
did search past archives but could not find any information related to
the problem I have.

I have been trying my hand with QTR lately. I was able to successfully
print some images on both EEM and Hanehmule Photorag some time ago,
while using version 2.6.0 of QTR. After I upgraded to version 2.6.1,
however, I started getting muddy, flat prints. No matter which
printing model I choose, or which brand of paper I choose, I always
get the very same muddy looking print. Right-clicking on the Curve
drop down list results in the same ink curve being displayed, no matter
which paper profile I choose. I reinstalled QTR several times, and
always get the same results.

Just to be sure I furnish all the relevant info: (1) I have
successfully run QTR on 64-bit Vista for several months now and, up to
the present, nothing wrong happened. (2)Also, when I print from CS3,
using Paul Roark�s profiles for the R220 (the same printer which QTR
seems to have problems with ), everything goes fine and the print
comes out with the looks I intend it to have - i.e. it does not seem
to be an issue with the print head parking pad.

Does anyone have a clue as to where the fault is, and how to restore
QTR back to its original smooth high-quality printing behavior?