I am very sorry to hear of this frustration. Can you help me with some more information?
-What browser/version are you working in?
-Are you seeing a spinning wheel once you first log in or after clicking a specific area?
I am sorry to hear this is happening. I sent you an email directly with some specific questions to get more information on this.
What browser are you working in when this happens?
I am sorry to hear that you cannot view or manage your registrants. I went into your account and tested a few different event campaigns that have registrants, and I was able to view the registrants. Can you tell me what happens when you click View/Manage registrants from the event dashboard please? Do you get an error at all? Any information that you can provide would be helpful. If you would like to keep this information private, you can email social_support(at)constantcontact(dot)com with a reference to this post, the details, and your username.