My first thought is re-boot the 121. Unplug and touch all the buttons on the face plate to discharge any stored capacitance then restart and see if you get different results. If that doesn't do then check the settings on that HDMI input for modes. I have not had the 121 but had a few different McIntosh pre/pros and in my experience if has worked correctly and just doesn't then the re-boot fixes it. I have an Statement D2V that I have had to re-boot as well. Anything with a processor sooner or later stores a misguided command.
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