Question

Please take a look at this fiddle

http://jsfiddle.net/Qstuw/7/

First answer is selected by default, when you enter to the page. Try to select second answer. Then return to 1st and select it again. I don’t understand what am I missing, but I can’t select first answer again. Any suggestion?

UPDATE

Based on first answer:

True answer must be "switched" between answers. Like on SO. All other buttons must be enabled when you click on some active button and the button on whitch you have clicked must be disabled. Green border only on answer where you’ve clicked

Answer 1

You didn’t redeclare the button. Should get you closer

AnswerDiv.on("click", ".NotSelectedAnswer", function(){
    $(this).button("disable");

    SelectedAnswerBtn.removeClass("SelectedAnswer").addClass("NotSelectedAnswer").button("enable");
    $("div.Answer[data-id="+SelectedAnswerBtn.data("id")+"]").toggleClass("SelectedDiv");
    $("div.Answer[data-id="+$(this).data("id")+"]").toggleClass("SelectedDiv");

    NotSelectedAnswerBtn=$(".NotSelectedAnswer");
    NotSelectedAnswerBtn.button('enable');
SelectedAnswerBtn=$(".SelectedAnswer");
AnswerDiv=$("div.Answer");
})