Hi, what do you mean by no clickable part? It should look like this.
Could you please try clicking 'Show Expert Options' check-box and tell me what is listed as your server under the Battle.Net API settings page, and if that is the correct server for you?
Hmm yeah i suspected, the character switch feature requires that it knows what server you are using to grab a list of your available heroes from Battle.Net, and that part must have failed. :S