Digital BW, The Print

One, two, Freddy's coming for you.
Three, four, better lock your door.
Five, six, grab your crucifix.
Seven, eight, gonna stay up late.
Nine, ten, never sleep again….




So, they are blaming the problems on air bubbles... if you have a
syringe you can draw out a little ink from the cart and leave a drop
where the cart goes onto the printhead. That should eliminate the
question of bubbles (though it is odd that the problem goes away as
soon as you switch to Epson carts).