url address with the "https" prefix are protected addresses and will not work with our internal trad gang image processor. changing it to "http" works perfectly. the other thing was that the original address you copied in was an album address that was missing the "i.", which makes it a direct address to the image gallery. mobile devices like ipads use totally different browsers than "real computers", and pretty much anything goes with those things! but no matter what, rewriting the address to this format will definitely work ...
[img]http://i.imgur.com/FPse5bu.jpg[/img]
note that ...
FPse5bu.jpg
... is the actual image file, and ...
[img]http://i.imgur.com/[/img]
... is the specific url address where that unique image lives. hope this helps!