Unity games in facebook fails to load... Sometimes...

I am stuck with some serious headaches over this one issue.

I posted a small test build of a game i was working on, to it's own Facebook page, using the neat new facebook-unity sharing. The game is set to be public for everone to see.

When i visit it, from my own mac, everything looks perfect. When other people tried visiting it, they got stuck at the loading screen, seeing only the game icon, and a empty progress bar, forever...

I have been rummaging around, trying to identify if this was due to testing permissions, cdn servers or something like that, when i realised that if I jumped to another computer similar to mine (a mac mini, using safari with the unity player installed), even if I used the same developer enabled facebook account, i too reached the stunted loading screen.

No amount of forced refreshing or browser flicks have solved this for me, and facebooks gives me nothing to work with except "Error occurred..." -details > "an error occurred."