Sorry, Mark, I may not have explained myself very clearly.
Printing the untagged targets from ACPU under Lion produced the correct results from which an accurate profile could be generated. Printing the same targets with everything the same, but under El Capitan, produced targets which were degraded (as shown). The images in my original post are for illustrative purposes to show the differences except that the screen shots of the targets in ACPU show fairly accurately how the targets actually print. This is irrespective of the target and is replicated with every untagged image (I even tried some other untagged images to check it wasn't just the targets).
I can create accurate and usable profiles using targets printed directly from the ColorMunki software, but ACPU will not print the targets correctly. My colour management is working fine and I can produce excellent prints using the profiles created from the ColorMunki software.
The only differences here are the operating system and that ACPU will not display or print untagged images correctly.
Have you recently tried printing targets from ACPU under El Capitan 10.11.6; and do they match targets printed under earlier Mac operating systems ? A quick test is to make an image containing maximum saturation CYM and RGB, and compare it in Photoshop and ACPU (in my illustrations the differences are somewhat obscured by the complex second target).
It would be good to know if this is a problem with ACPU and more recent iterations of the Mac operating system, or whether it is something particular to my system. It would also be good to know whether this is replicated under Sierra.