I searched this thread and did not see this bug, so I apologize if this has been discussed.
I have uploaded events via an 920xt and TrainerRoad with 4iiii and powertap power meters. In Garmin Connect (web Modern view) in all instances, the Max Avg drop down to calculate average power figures (5sec, 1min, 5min, etc) results in error "An error occurred calculating average power."
In Classic view, the buttons to calculate these figures are unresponsive.
Tested on Chrome, Edge, and IE 10 browsers.
Thanks,
Dave