Just to say that I understand what Colin is talking about. The site itself used to provide a gpx viewer, with no need to download and view in an application on whatever device people are using to view the site. Personally, I prefer my own applications for viewing gpx files and don't make use of it, but the point here is that it did work and at the moment it doesn't.
Hovering over the blue rectangles reveals the text 'GPX viewer' on them, but clicking them gives an error. To be clear, this is the horizontal, solid, blue rectangles above the attachment icons, *not* the attachment icons (vertical, just an outline in blue). i.e. the ones I've circled in grey below:
View attachment 644765