Hi - I am getting the same problem. The workflow supplied by Piezo for the 21x16 does not create a patch chart that matches the 21x16 test chart image. It is the wrong workflow, so i1Pro cannot measure the printed chart.
The first image here is the workflow file Piezography-21x16step-i1Pro2.pwxf, as seen in i1Profiler.
The second file is the chart that is to be measured. They are incompatible.
