I keep getting this error when trying to log on. Takes a few tries or log on from other than the home page.

In order to accept POST request originating from this domain, the admin must add this domain to the whitelist.

On a blank page with nothing but that sentence right?

Happened to me all the time last week and I just hit refresh and it would work each time. I didn't notice it stopped today until I read this. Not entirely sure how to fix it though =(

Could be related to: http://wow.thedruidsgrove.org/forums/showthread.php?t=12214 ?

Nope, not related to the updates I did. This problem, however, should have been fixed.
Same bug as this one: http://wow.thedruidsgrove.org/forums/showthread.php?t=12208

I need to know exactly what page you're logging in from that's getting this error; the full URL of the page. Copy / paste the line from the Address bar into your message.

*Update, should be fixed now. See above link for description of the problem if you're interested.