It shows the quality of the software developers working for Garmin as they are not able to solve this issue within 2 weeks (or even more) since it was discovered...
Strava does show the cadence data by the way. I'm using that together with some friends that do not own a Garmin device.
Hello same problem here.
I've a fenix 2.
I made a comparison between two tax files, one from my fenix 2 the other from a 620.
The file from fenix 2 includes <MaxRunCadence> and <AvgRunCadence> tags, It does not include the <RunCadence> tag (which is available in the 620 file).
I think this might be at the origin of the missing chart on my F2 detailed activity page. Of course Avg values are there and correctly displayed.
My firmware is up to date.
Hope it helps.