Shazzdan, I have posted a formal question on the Forumotion support forum and will let you know what they come up with. Or you can follow along yourself:
https://help.forumotion.com/t156002-problem-viewing-specific-servimg-hosted-images#1075022
Update: a further clue -- when I posted the example links in the question post, their url automatically changed, losing the "62" after the initial "i" -- and with the changed links I was getting the same result as you -- DFC's Jack Burton photo did not load, except as a tiny 1 x 1 dot in the middle of a blank window; strangely, my Agent K photo still worked, even with the changed url. I added this observation to my question.
This has got something to do with it, and is apparently a coding problem.