Digital BW, The Print

Hi all,

I am wondering if anyone has had this experience. I have been 
printing and noticed that my aRGB to ABW driver prints have been 
having a slight green cast for some time. I have been compensating 
for this by using the toning wheel to move toward the magenta (eg 
6h/-3v). Well, I just changed over to a new light magenta cartridge 
and whammo, all the prints were looking quite magenta and now 0h/0v 
looks fairly neutral on my prefered paper of EPSG where as before it 
had a slight green cast. I am sending aRGB files to the ABW driver 
with no color management from Photoshop as I always do. Also I have 
run nozzle checks frequently and there never has been any problem.

So Have people noticed that inks can loose their intensity in the 
cartridges? Mine probably has been in the machine for 6 months max 
if I had to guess. Can dye lots be this variable. Any thoughts from 
our fellow r2400 users? Will I have to readjust my toning everytime 
I switch a cartridge? Thanks for any help you can give.