You hit that page during a very brief window between my adding a new ad agency and activating them and setting their weighting. It's working fine now. That window was only open for about 15 seconds and you had a 1 in 20 chance of hitting it.
Edit: I'm amazed to see that the Anagram solver is the 4th busiest page on the site today. Wow!
Edit 2: Actually, our Anagram Solver is pretty high on the results list on Google searches. Could be because if you're just wanting to unscramble one word, it looks like ours is orders of magnitude faster than any other ones.