I have tried in Chrome and Mozilla

Hey Dave, we were just in the middle of a deploy and had to roll it back, so this might explain it. I just tested creating a page and was able to ok. Can you try one more time and let us know if you’re still getting that error?

problem still exists after refresh

here is a screencast - http://screencast.com/t/lEjzVzlkm

Ok, thanks for testing that Dave. It’s something associated with your account, and doesn’t seem to be affecting many users (we’ve only seen it happen a few times in the last few days). We’ve logged a bug for this and are digging into it, I’ll be sure to update this post as soon as we have more information. So sorry for the hassle!

Thanks for the screencast Dave! We did find an issue with your account, and it looks like we’ve patched it up. Can you try again and let us know?

Also, had you previously tried to add a custom domain and run into trouble with that?