ThemeRoller is broken on the site

ThemeRoller is broken on the site

There's something strange going on with the ThemeRoller on jqueryui.com.  The Roll Your Own works if you want to do a theme from scratch.  But if you select an existing theme from the gallery and then click "Edit" to modify the page hangs and theme editing controls never show up.  I tried in Firefox and Opera.  Same result.
Is anybody else seeing this?