Cannot resend Notifications

I am still having problems resending notifications. In the past we only checked "Notify Every Site User On New Posts" in the settings section and if we clicked the resend message on the "posts" page the notification would be sent to our entire membership. Now that does not seem to work. To make matters worse, selecting "custom Notifications" does not appear reliable. This morning I have tried both.

I finally got notifications for a message to be re-queued. Now I suspect that because I tried more than once to re-queue the notifications my users are getting multiple copies.