Garmin VIRB images fail to upload

I have previously uploaded many sequences from my Garmin VIRB camera, but I am struggling with my latest pictures. The upload appears to start normally, but then the image icons turn red and I get the following error message. Can anyone tell me what is going wrong?

@Hobgoblin have you shared this issue with support@mapillary.com? It’s definitely something we need to investigate.

I’ve been uploading loads of Garmin Virb images myself (some as late as yesterday) and I’ve never seen any fail like that.
I do have an idea about what could be happening here though (see Borked westbound Garmin Virb image directions). Maybe the website now checks whether the direction value is between 0-360 and rejects images which fail that check?

Thanks for the suggestions. I tried a few things and I think I have found a reason for my difficulties. If I use Google Chrome instead of Firefox, the upload works. I have the NoScript add-on installed in Firefox, so maybe that was stopping the upload?