Im using Zwift on a TACX smart flow trainer and for the last few weeks I am getting no changes in resistance at all from ZWIFT as I either climb or defend. I have made sure my trainer has the latest update and my ZWIFT app is also unto date, its so frustrating as I am having to climb in my hardest dear just to get the feeling of resistance.
I am running Zwift on a MacBook Pro with the latest operating system.