I have exactly the same problem for a couple of days now - I'm not sure what is not loading, the page is there, but it's empty except for the title and adds. Some links are there but are leading nowhere (#). I would venture to speculate that database content is simply not available.
The problem did go away a couple of times, but it was literally for just one page at a time. It happens identically across browsers - I've tried Safari, Firefox and IE.
Updated Java.
Flushed DNS.
Browser reset.
Cleared Cache.
Nothing helps.
All other pages and portals and whatnot are loading normally and internet works as intended...
Moreover, it seems it was getting progressivelly worse over a couple of days - first I would get it and reload and it would go away, and gradually it became more malign, and as of now I'm unable to open anything, not even my profile.
=(