Make sure that your sorting is set correctly? If you set your default sort to "top day" in your account then your linked community will have no posts since none have been made in the last day. Unregistered default sort is "active" so that shows posts.
When trying to post try setting the language to English. Also goto your settings and make sure all languages are selected or at a minimum “undetermined” and “English” and check that community again to see if posts are showing.