Chroma footer works in English but not in German RWML

I set my footer in Chroma Pro so that it appears (slides up) when the browser reaches the bottom of the page. When you scroll up again it disappears (slides down). I use RWML to get an English and a German version of my website. Chroma Pro only works in the English but not in the German RWML section of my webpage.

See the test page here (please compare the English version with the German version on ‘home’ and ‘about’)

Why does chroma not work in the German RWML? How can this happen? Does RWML change the behaviour of Chroma?

Cheers, Gabor