I just started noticing problems earlier tonight sometime around 8:30PM - 9:00PM EST
I would get this message:
The site is temporarily unavailable.
Please come back soon.
I mostly use FireFox 3.6 Beta 5 with Adblock Plus.
To reproduce the problem, While on the forums main page:
http://www.tomshardware.com/forum/
Click the Home Button (to left of Articles button):
http://www.tomshardware.com/us/
Then use the back button on your mouse or the browser brings you back to this address: http://www.tomshardware.com/forum/ but with this message:
The site is temporarily unavailable.
Please come back soon.
Reload the page without clicking anything and the forum page would load up correctly.
Same thing happens when you click on any of the forums from the main forum page, then try to return, but a refresh fixes it.
But clicking if you are in one of the forums and you click on a post, then return from the post, this does not happen as this is the one place that things appear to work correctly.
One other thing I've noticed all day today is in any of the forums under Motherboards & Memory, it seems that the Latest Best Answer in the right column appears to be messed up as it looks like it's in a long, tall column no wider than the Preview & Submit buttons for the message box I'm typing in here.