Trying to place the blame on inkjets is pretty simplistic when its the drivers along with the OS and applications that have to all behave here or Jame's files (which I have) point to a disconnect.
I think you may be misunderstanding what these files are for or what they do. They don't tell you where to place the blame, only that the path is hosed.
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The driver and systems and apps were mostly cooperating ; now suddenly the situation has deteriorated. Why ? Does it matter ?
Why point fingers ? the apps and the OS and the drivers just aren't working well together anymore.
Time for all of these guys, OS, App, and printer to get TOGETHER and sort it out.
Robert Krawitz who makes the open-sourced Gutenprint RIP has been updating his inkjet drivers, and designed some very interesting techniques to check that the output remains the same. I find it amusing that when I suggest to industry people that they build such in - checks that the system hasn't got corrupted by "newer better versions" - all they do is explain "why" this is impossible.
BTW I think there's a consensus that the users find the print interfaces confusing and these need to be revised.
Finally, I do find it strange that the profiled workflow keeps getting totally hosed but the "Printer Managed" workflows always produce acceptable customer quality.
Edmund