I ran across this while working on a checkbox "check all" script.
http://members.iinet.net.au/~malen/jquery_ie_checkbox_bug/ Firefox, Opera and Safari all work correctly, however in IE6 and IE7 it requires 2 clicks in order to toggle the change state. The wierd thing is that the two clicks don't double-toggle the checkboxes. I've done a search but couldn't find anything relating to this bug. Anyone have any ideas?