The ideas from the Mozilla discussion, relating to whenever you have one site that doesn't work, is to clear cache, delete all cookies from the site, and maybe try the site disabling first ad or flash blockers, and see if that makes a difference.
Now the poster already has cleared cookies and browsing history, so all that leaves from the Mozilla discussion that may help is the idea of: (1) clearing the browser's cache (The poster does that in: Opera Settings (Alt P), Privacy & Security, Clear Browsing Data)(Browsing Data includes more than the history, but also anything that may have been downloaded associated with a site); and (2) disabling ad or flash blockers if he has any.
Otherwise, the idea of going back to the earlier version makes sense just to see if that makes a difference . . . I found interesting that the person in the Mozilla discussion had a very similar situation. The MSN.COM site showing up blank/white in the browser.
