Tripped me up for a whole day this one. We have a number of content editor web parts on our intranet home page. One was working, three others that used the jquery ui were not.
I checked that all the paths to the js and css files were there and valid. All OK (excepting that we hadn’t copied the jquery.min.js file into the layouts folder).
Problem turned out to be that in upgrading the content editor script, the html bits were stripped out. Each contained a javascript part and a html part.
I converted each to files, added the html back in and then linked to the newly uploaded file.…