Unfortunately the problem is with your theme. The slideshow also uses the jQuery UI tabs component, but rather than using the version that ships with WordPress, the theme is including its own minified version. Perhaps your theme was built before WP started including jQuery UI, or perhaps it’s just poorly designed, I can’t say.
Rehabtabs checks that the shipped version isn’t already included in your page before loading it itself, but it can’t check for randomly minified scripts that have been included in other plugins/themes.
So basically your site is loading jQuery UI tabs twice, which is causing the issue.
Sorry I can’t be of more help.