Digital BW, The Print

That sounds a little worrying. Just bought two sets myself. Firts set 
has only had one refill so far and all is working fine. If I have a 
problem I'll let you know. Checked the MIS site this morning and they 
are still selling the carts. Looks like they have reduced the price.

Hope you solve your problem.

Peter.

PS Have you asked MIS if this is a known issue?