Hi Pat,
Trying to run “visual compare” chrome gives me this error:

“HTTP Error 403 (Forbidden): The server refused to fulfill the request.”

Opera gives me just a blank page and no error.

You can check my user history - I tried running the test several times today and yesterday.

Sorry, should be fixed now. I put in a bunch of protections on Friday because of some exploits that were reported and it looks like one of them was overly aggressive. Let me know if you bump into any other errors.