<script type="text/javascript">

$(document).ready(function(){

$("#all").change(function(){

var status = $(this).is(":checked");

$('input[type="checkbox"]').each(function(){

$(this).attr("checked", status);

});

});

});

</script>

It changes in code, but does not change visually. First two clicks on all are ok, but after them not.

Tried on latest version 1.8.3, and it works fine.

So I guess bug!