Some of my printers have separate advanced settings on the printers them selves, and if that is not it, it might be a driver issue, where are the drivers located, are they on the local machines or is this a TS or Citrix environment? I use Citrix and have had to go to a Bata driver and even that has not solved all the problems I am having. With one of my printers, I was using a jet direct to put it on the network but had to go to an internal network card to solve some communication problems, don’t ask me why that worked but it did.
