Digital BW, The Print

It seems as if I have been plagued by every possible technological 
gremlin lately.

I had finally gotten myself happily printing along with UT7 inks in a 
brand new 7600.

Now the ink light comes on for the Matte Black cart and the LCD says 
"Set Ink Cartridge".

I really doubt I have used the whole thing, Epson Status showed all of 
the carts at about 90% full a day before this and when I shake the cart 
there definitely seems to be a significant quantity of ink in there.

As a check I inserted a Black Position Cleaning cart (brand new) into 
the slot and got the same message.

I haven't placed an Epson Ultrachrome cart in there yet as I am afraid 
the inks will be incompatible and cause worse problems.

I put a support request into MIS and will give them a call on Monday, 
but does anyone have any experience with this?

James Haney