Did you mean, you disabled the plugin and then your post did not show FB gallery? Of course if you disabled the plugin after you set your post to pull the images from your FB gallery, it would show nothing, because the plugin is no longer active.
The gallery seems to not work after a few days and if I disable the gallery plugin i can see my full post minus the gallery. If I re-enable the post and reset my authentication it again works but only seems to last a few days. If you look now it’s not working again.
I had to disable the plugin then re-enable it again and then reset my facebook token. It seems to happen every few days. Is there a log that i maybe go into and look what keeps causing it? I love your plugin and want to continue using it.