It looks like there is a bug with the radio group value lookup code, i have looged this in our bugbase
look for the following code:
else if (inputType == "radiogroup") {
alert(formElement.length)
for (var x=0; x<formElement.length; x++) {
if (formElement[x].checked && formElement[x].value!="") {
value = formElement[x].value;
break;
}
}
}
and change it to:
else if (inputType == "radiogroup") {
if (formElement.length) {
for (var x=0; x<formElement.length; x++) {
if (formElement[x].checked && formElement[x].value!="") {
value = formElement[x].value;
break;
}
}
}
else if (formElement.checked)
value = formElement.value;
}