VIRB Edit 3.5 - No Data Appears on Overlays

Hi

I just tried using VIRB Edit 3.5 by importing .mp4 video shot with a GoPro and then importing the .FIT file from my Garmin Edge 20 using the G-Metrix tab. I select a template and the gauges appear on the video preview, but no data is ever present (all 0's or "--" Is there something special I need to do to get the data to display?

Thanks in advance

Mike