I have an unordered list defined as a Sortable. It contains list items, each of which contain a checkbox and a text field.
In IE6, if I drag any of these list items, the checkbox reverts back to the value it had at page load time. If I click on a checkbox to change its setting, and then I drag the containing list item, I can see the checkbox either lose or acquire the checkmark as the item is dragged, depending on what it's value was at page load time.
You can reproduce the problem using the functional test dragdrop3_test.html, if you enable its checkbox.
I see this problem in IE6, but not Mozilla or Firefox.
I encounter the problem in both version 1.5.0 and 1.5.1 of scriptaculous.