I've been finding the same thing with the dropbox link to my Board Horde game, but only on certain systems; it works perfectly fine on firefox on my laptop and safari on my ipad, but when I close it down on IE 9 browser and try to reopen it again it hangs at the loading screen (or only partially loads for one other user). I did discover that clearing the history cache made it work again on IE (until I close the browser, then it hangs again when the link is reloaded).
It's possible that it's something I've done in the export, though it seems odd that it was working perfectly fine at one point.
If you post your link here I'll give it a few tests on various machines, and let you know what I get (might not have a result until the end of the day)
If you're able to do the same with this link and let me know if you have problems, it'd be appreciated.http://dl.dropbox.com/u/97335933/BoardHordeC2ver2/index.html