Digital BW, The Print

I am having problems with a new set of MIS VM cartridges on a 1290 
printer.  I have been using the MIS VM inks for some time and have 
been very happy with the prints.  I recently purchased some new 
cartridges (two diferent batches) but when I installed one of them 
the prints came out with a magenta hue.  I use Paul's EAM nc1 curves 
and print on Epson archival Matt paper, nothing had changed in my 
workflow except for the new cart. I have tried using all PR curves 
for both EAM and RAG and the cool and neutral prints all have the 
magenta cast.

A `purge' pattern print shows a distinct magenta hue in both the blue 
and light blue inks when compared with the previous carts and they do 
not match the swab colours on the MIS web site.


I tried a cartridge from the second batch and the tints were the 
same.  I then tried the carts on my second 1290 and again the tints 
had the magenta hue.  I repeated the tests using both Picture Window 
and Photoshop Elements with the same result.

I have removed and reinstalled the Epson printer driver but still 
have the problem.

I have e-mailed MIS and have sent them examples of prints but they 
cannot explain the problem.

Has anyone had similar problems?

Paul, have you any suggestions? 


Regards
Garry Bisshopp