Podcasts do not play

Just installed Lion server which I want to share podcasts on the intranet. I can produce podcasts in publisher and upload them to the podcast service. They appear in the Wiki, I press "play", a window opens and it hangs saying "loading". The error I see in the system log is

Oct 26 19:18:38 philk com.apple.collabcored3[496]: DEPRECATION WARNING: :x_sendfile is no longer needed in send_file. (called from download_file at /usr/share/collabd/coreclient/app/controllers/files_controller.rb:329)

Server has self-certificates and correct apple push notifications. I would appreciate any help. Thanks.