Stream broken on some pages only

Hi,
first thanks for your really great plugin, I enjoy it a lot.

I have a problem with the stream on my starting page (on the right of the page as a widget). It is not shown correctly, most of the nice stream features are broken.
http://www.achteminute.de/

On other pages, however, it displays correctly:
http://www.achteminute.de/termine/

Most probably, something breaks the stream on the front page which is not present on other pages, may be the slider. Can you help me finding a way to make it work there as well?

Thanks for your help
Philipp

http://wordpress.org/plugins/flickr-photostream/