Hi,
I use a Garmin 310xt during my running. I usually upload my data to the Garmin Connect site. I also like to have the data locally on my laptop, so I export it as a .tcx and import it into Garmin Training Center.
Up until 3/7/2015, elevation data was exported as part of the .tcx file. Since then, whenever I export, there is no elevation data. I can see the elevation data on the Garmin Connect site, but it's not exported to the .tcx and not imported into my Garmin Connect.
Anyone have any idea why?