Erg-mode problems after latest software update

I run a Tacx Flux S and an iMac running OS 10:15.6. I only use the training mode. Before the update I had no problems; the resistance changed as they should during intervals without the need for shifting gears. Now when I run a recovery workout with a programmed steady resistance, but with cadence changing between 60 and 90 I have to change gears every time I change the cadence to keep the resistance constant. The erg mode is activated and working, only not as seamlessly as before the upgrade. Any thoughts?