Digital BW, The Print

I'm using the MIS Archival 7600 inks in the easy refill MIS 2200 
cartridges.

I've been pretty busy the last couple of weeks and the printer has been 
unused. When I made a print yesterday the print came out bright pink. 
Several nozzle checks did not show any problems.

I took out the cartridges, shaked them a little bit, put them back in
and ran a couple of head cleanings and everything was fine again. I now
get prints that match what I see on the screen.

Anyone else experienced this?

--
Daniel Staver
http://daniel.staver.no