All images within the Library show as blank images after following the "View" link or after following "Edit" and then "View Attachment Page". The images show up okay as thumbnails in the Library, within the media editor, and when clicking the blank area where the image should appear within the media viewer.
It may have something to do with the permalink, since that is in the address of each page where the images do not show; ie. "http://burkharttech.com/?attachment_id=31".
I thought it might be Jetpack's Photon module. But, the problem remained when it was disabled.
This problem is occurring in one of my WordPress installations. But, the other two are fine. So, something is likely corrupted.
Any ideas how to try and fix permalinks? Or, what else to try?