1) Jealous, is all
2) Now to
your problem:
Since it happens on two (still hopefully) unrelated sites, my thoughts are that it's your-computer-centered.
So you've "cleared your browser cache", hopefully with a deliberate menu selection, and to boot, delete all
temporary files that it lets you do. On your Mac, are you using Safari, or any other Mac-type browser?
Have you got any other browser, such as that always have Javascript enabled and updated? Almost all do, anyway,
so exit the sites on your main browser and close that one down. Try a different browser and see what happens (and
tell us).
Make sure of 2 things first: That Javascript is indeed enabled in the new browser, and that you only open one tab on
one site - for the present - only.
Whatever happens - ie, success or not - re-open your original browser (and don't forget to tell us what it is sometime)
in SAFE MODE and run the same test on the two separate sites (and any other that you host pictures on, like Flickr,
Google...)
If that also works, then you can begin to suspect some add-on is affecting things... More anon, upon your reporting back.