Little background - I have the latest version of your plugin and the latest version of wordpress. I have it setup to instantly send and have both facebook and twitter setup and this did work in the past.
When a test is conducted via the admin panel the test is successful.
When a post is created the checks are selected for both twitter and facebook until post content is entered. On focus they deselect, so before publishing I select both and then publish. The log shows that they were sent to the api but the posts are never sent. However, if I edit the post and resend the posting is successful.