[galaxy-dev] Sample tracking dataset upload file browser

Hi, I just updated our Galaxy to the newest version in http://bitbucket.org/galaxy/galaxy-dist/. Now I am wondering why I don't have the nice dynamic file browser in the sample tracking dataset upload anymore. There is no extra window with a scroll bar and when I select a file and press "select datasets" nothing happens. I attached a screenshot so you can see what I'm talking about. Thank you very much for your help! Best regards, Sarah