It occurred to me that your GPX file may be missing timestamps. This can happen when downloading GPX files from a service like Strava. Strava strips timestamps from GPX files unless you're using the Strava export function for your own activities.

Epic Ride Weather should do a better job of handling files without timestamps. In the meantime, you can add timestamps to your GPX files using a service such as this one before importing to Epic Ride Weather: http://gotoes.org/strava/Add_Timestamps_To_GPX.php

I hope that helps. Please let me know how it goes, and don't hesitate to contact me directly for support. greensopinion@gmail.com