[Plugin: Facebook] Post to Fan Page does not work for some users

I am trying to use the Facebook Plugin to publish to a Fan Page but I am having difficulty making this work for multiple users. I created the fan page with my Facebook account and I made the other users that I want to be able to publish to the page managers.

However, the publish to a page feature does not work unless I am logged in to Facebook. Also when the other users try to view the Publish to a fan page setting in WordPress the only option listed is [Disabled] whereas when I view the setting it lists all of the pages that I am a manager for.

Any help in resolving this problem is appreciated. I have tried deactivating and reactivating the plugin but that has not helped.

https://www.ads-software.com/extend/plugins/facebook/