Calibration in Pianoteq ... where did it go?

Somehow the calibration routine in my Pianoteq no longer works. When I press calibrate, I get the option to start the calibration process. All good. Next, it says place the softest note I can. When I play that soft note, or any note, for that matter, the velocity registers in the graph. But the text that says what the velocity was doesn't appear nor does the timer on the next button start. So no matter what I do, the calibration process doesn't happen.

I tried installing a new copy of Pianoteq last night and still the same problem.

Any ideas about how to get the calibration process back? !!