The bundled themes (clickr + lefthand nav) require immediate attention as they have a number of bugs that makes them unusable.

There are few related issues, three of them are documented here, but if you just take a quick look at each of those themes you will know what I'm referring to.

I would be glad to provide more specifics if need-be, but because there are many related issues, the sensible thing would be to have QA test this.

Just let me know if I can help by providing further details.