Ultimate Facebook - Network - Users unable to publish

Hi, - I have Ultimate Facebook installed, the API working, Network set to share my API key with sub-sites (all network options are checked), extended permissions granted, but my sub-sites are unable to publish to FB. At the bottom of Posts and Portfolio items the "Facebook Publishing" option appears with a box to "Publish on Facebook with different title:". No account selection option is shown. When I click on "Update" for a Post or Portfolio item nothing is published to FB.

My objective is to allow sub-site users to use my FB API, but post only to their FB account, not mine.

Any suggestions?

Thanks,
Rob