I tried that, Antony. I have a feeling that somehow my Firefox profile has become corrupted. But why SillyDog is the only site that appears to be affected is a mystery.
As I mentioned before, I will come here and am forced to log in. Once I do that it tells me my log in has been successful. But it then loops me back to the log in page and I have to start all over. So, I delete all cookies from the link at the bottom of the page, I indicate that I've forgotten my password so SillyDog sends me a new one, I return to SD with the new password and the loop starts all over.
This is not a problem for any other site using Firefox. It is also not a problem here if I use IE9 or Chrome. It's just Firefox.
UserAgent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.3 (KHTML, like Gecko) Chrome/6.0.472.63 Safari/534.3