UPDATE 2 - RESOLVED:
Got it working: http://jsfiddle.net/7CvZ9/12/
Had to add some classes.
UPDATE 1
It is working a little better, because I have cleared up the resource management section of jsfiddle and only have the following resource now:
This has fixed the dialog, but the sortables still don't seem to have a theme applied.
ORIGINAL QUESTION:
I have setup 2 basic examples in the links below to show the problem. For some reason, I can't seem to get the ui themes to work properly.
http://jsfiddle.net/7CvZ9/ and http://jsfiddle.net/7CvZ9/1/
For example, the dialog theme is messed up, and the sortable theme is not showing at all.
Not sure what I have overlooked.
There could be only few possible reasons you don't get the style applied.
And I think your problem is of type 4.