Can't Login to One Website

No its not a mobile login. It is my same dell computer that I have been using for all my clubs. It doesn't make any sense either. I cleaned all the cookies still didn't help Delete the Bookmark and all of the passwords except one I missed. The error message I have been getting since I am trying to login in says the session ID attached to my email is not valid, I can still cannot log in. I haven't made it to a different computer yet. I am using Avast as my Anti Virus. Could that somehow be blocking it?

I was able to log in and logout as you. Please try it now.

go to 2870011.toastmastersclubs.org
click the member log in
type your name and a space
select it from the list (could be only one)
enter your password.
click Login