Tabs broken in 1.8.11 ?

Tabs broken in 1.8.11 ?

Just used the themeroller to generate new css and js files (created jquery-1.5.1.min.js and jquery-ui-1.8.11.custom.min.js). When I lined them to an existing page with existing tabs(previously 1.8.7), the tabs broke broke -- all content displayed vertically under the first tab, no ability to navigate to other tabs.

I checked the demo file in the download package (jquery-ui-1.8.11.custom/index.html) and the tabs are broken there too. Is this a problem with 1.8.11 or could themeroller be having problems?