And I got a guess: My theory is that it has to do with the extension letters at the end of the linked url. If it ain't .jpg/.gif then it might not get recognized as an image.
'We, the weird, chasing the pointless, for no reason at all, have been finding out things that have no effect on anything important for at least a couple days and are now qualified to chase our tails to the merriment of all watching.'-Narf et al
"Of course, you don't want to be going about handing out immortality willy-nilly, that just wouldn't be responsible." -O'Shea