Cannot perform a calibration of Zwift hub since the last firmware update?

There is no longer the ability to perform a calibration procedure with the Zwift hub since the last mega buggy firm ware update.
9 out of 10 times in opening the program the little wrench next to the connected device menu is not there, I managed to open the program once and it was there, I clicked on it to see if it functioned and it brought up the calibration page, I backed out of that for a second and now the little wrench icon is no longer there at all...

Anyone else have this issue?