Digital BW, The Print

Having problems using Epson Matt Black ink and Archival Matt paper on the 
2100 printer.  A file in Photoshop CS will not be processed and the printer 
utility will indicate that the job has been stopped. The inks are correctly 
installed and are showing up properly in the printer utility. If I change back to 
black ink and print on Premium Semi-gloss for example, the same file will 
print OK. Any kind soul have any ideas?

G4,OSX, PhotoshopCS, Epson 2100.