Thank you for the replies and suggestions. I will try to respond in order.
I used QTR in calibration mode in order to print a test of each individual color as provided by the software's author, to confirm that each color was firing and printing as needed. This was a backup to the nozzle check. I was not trying to print all colors, just the individual colors or channels.
I have deleted all files pertaining to the printer, including profiles, rebooted, and reinstalled once, and have started the process again. I have not checked other papers/profiles to determine if they are affected. I will do this next.
After much searching, I have not seen this problem reported elsewhere, so I am assuming that this is a unique occurrence.