jQuery Forum

the newest themes work with the newest code, but you might want to
review the latest CSS changes - I found that I needed to modify some
of the class names I was using in my markup
http://docs.jquery.com/UI/Theming/API

That's correct. There are two scenarios we currently support
Scenario 1
jQuery: 1.2.6
jQuery UI: 1.5.3 (latest stable release)
ThemeRoller theme: 1.5 theme (download link at bottom of left nav)
Scenario 2
jQuery: 1.3 (latest stable release)
jQuery UI: 1.6rc5
ThemeRoller theme: 1.6rc5 theme (default download link at top of left nav)
When we reach 1.6 final at the end of this week it will be a little smoother in that our latest stable release will be compatible with the latest stable release of jQuery. ThemeRoller will continue to serve 1.6 themes by default, but provide a link to 1.5.3 themes, for those still using 1.5.
- Richard

Thank you for the pointer. The new version changed a lot, it seems. I
solved my problem including 3 (core, theme and the one for the widget)
css files instead of one.