I have the same error since yesterday.
Windows 7 x64
Google Chrome 21.0.1180.89 http://lionizer.dk/wow/chrome.jpg
List of active extensions:
Adblock Plus (Beta) 1.2 (wowhead.com whitelisted)
Death to _blank 0.8
Diablo 3 (tm) toolbox 1.0.6
IE Tab 18.104.22.168
I tried turning on and off different extensions and it doesn't seem to affect it.
I managed to get a proper page load with all the content three times this morning while force refreshing 20+ times to check with different combinations of 0, 1, many or all extensions.
It works fine in my Firefox 11.0 http://lionizer.dk/wow/firefox.jpg