Houston, we have a Lift-Off

[ckh]

Try (assuming it's Windows) closing the browsers then.

Run > cmd.

Then ipconfig /flushdns on the offending machine.

I was going to say the same thing. This flushes the dns cache from your computer. The only other thing I'd recommend is after running that command, clear your browser before trying to access the site again.

You should not that running that command as shown, happens very quickly. You can blink and miss the popup window that opens and closes. This is normal.

Found what you need to run on a mac.

Open the terminal on your computer

On a computer running Lion (Mac OS X 10.5, 10.6, or 10.7) enter the following command followed by pressing the “return” key:

dscacheutil –flushcache

In Mac OS X 10.4 Tiger, enter the following command followed by pressing the “return” key:

lookupd –flushcache