I was notified that an image I uploaded for use in the infobox of an article ( http://en.wikipedia.org/wiki/Leadville_Trail_100 ) was orphaned. I determined that this was caused by the fact that the image link from the infobox was no longer functional.
I fixed the broken link by providing a value for the imagesize parameter in the infobox template.
As explained at the URL, the image link had previously been functional when I created the infobox this past August. I suspect that something must have affected image link processing in the infobox template code (Athleticrace) which caused the link to break. So it is possible that this has caused images on other pages that use this (and maybe other) templates to be orphaned as well (just a hunch, though).