Another update and now resistance increases downhill and eases up hill. I’m done. This isn’t a ‘the shadow on the butterfly isn’t realistic’ type bug, it’s the basics of what I’m paying for. You cannot in all seriousness have tested this. I’m running a Kickr Snap and MacBook Pro - so not exactly obscure tech (and tech that TrainerRoad has no problem working for). Subscription cancelled.
sorry mike, it’s gotta be on your end. i’m also using a snap on a 5 year old macbook pro and everything’s working fine for me.
you’ll be missed 
It can be very frustrating to try to fix something on your end without support.
Try Zwift support for some help. I’m sure there’s a fix for your problem.