Rodney:
Thanks for taking a look at the profile. I'm not sure what your information is telling me to do, though.
I did have another thought - Can other applications see the two profiles CS6 can't? I tried two random applications, and if you check the box "Show All Profiles", the two profiles I can't see in CS6 are present. I then went back to CS6, and in the printer driver box, checked the "Show All Profiles" selection. (Normally this panel is set for ICM and "Off (No Color Adjustment)" when Photoshop is controlling the printing.) Set this way, the missing profiles are in the printer setup dropdown menu. (See attached screen shot.)
So, If I turn this on in the printer settings, and select the profile I want, and then in Photoshop, select "Printer Manages Color" instead of "Photoshop Manages Colors", have I effectively worked around the fact that for some reason Photoshop won't present the profiles? And, if this is leading to something that works, should I also (or alternatively) select the profile in the "Printer Profile" dropdown - it is also available there.