If the image information shows RGB data with strong R, and/or low G, then printing with a magenta cast would be normal/accurate, but if the image data is strong in the B and/or G, then you would know it should print more blueish and less magenta- this is why I suggested checking the image information, to determine which system/printer is outputting correctly.
Not sure what you mean by this, please explain in detail.
If their MacMini to your printer is printing differently than your computer to your printer, then we would want to look into the computer setups. If you are getting different output from two computers to the same printer, than it's obviously not the printer that is the only factor in this situation.
In this case is was from one computer, their mac mini to their printer and then their mac mini to my printer.
As I mentioned before, the firmware versions of the two printers is a possible factor as well.
I agree on that but do not have access to their printer.
You originally wrote that you did a print comparison from your printer of Epson inks before switching to ConeColor, then printed the same image after switching to ConeColor, and felt the results were identical.
Yes, this is why I am confident that prints from either ink sets will be a very close match.
If your output is now different in both color and dMax, that makes me suspect 1. something has changed in your setup (such as OS version, Photoshop version, print settings, profile, print driver, printer firmware version, etc...),
Yes, a few things have changed: same printer, updated custom print profiles, updated firmware, newer OS, obviously different batches of paper and inks
and/or 2. you're dealing with the effects of settled pigment (in which case shaking your ink carts and doing a few Power Clean Cycles should help bring the ink density/color back to where it should be).
Pretty sure this is not an issue, I am religious about cart shaking.
There are too many variables in this situation, which make it difficult to troubleshoot.
I agree on that too, this one has me stumped.
Whenever troubleshooting a printing problem, I consider all the possible factors, then rule them out by testing and using a known base- including using a known test image (I just emailed one for you to use, since you can't disclose the client's image).
What do you want me to do with the test image? Do you want to see a print of it, perhaps compare to what you get?
Please keep me posted, thanks~ Dana