The fourth maintenance release for jQuery UI 1.8 is out. This update brings bug fixes for the Droppable, Resizable, Selectable and Sortable interactions as well as the Accordion, Autocomplete, Button, Datepicker Dialog, Progressbar, Slider and Tabs widgets. jQuery UI 1.8.3 was released a few days prior to 1.8.4, but there was a problem with the build system that caused some of the files to not contain any copyright information.
If you noticed the 1.8.3 release and upgraded, please upgrade to 1.8.4.
You can download it here.