Hi Phil. The customer was provided this snipped in support, which worked:
Here is a snippet you can add which will allow you to use a checkbox option that has value of none in order to deselect other options on the field.
$('.gfield-choice-input[value="none"]').on('change', function() {
if ( $(this).is(':checked') ) {
$(this).parent().siblings().find('.gfield-choice-input').each( function() {
this.checked = false;
});
}
});
$('.gfield-choice-input:not([value="none"])').on('change', function() {
if ( $(this).is(':checked') ) {
$(this).parent().siblings().find('.gfield-choice-input[value="none"]').prop('checked',false);
}
});