I don't know if this helps in locating the key as to why this is occurring but I can tell you this.  I do all billing on the 1st of the month. Yesterday I went to my recurring reminders and I realized I had not yet switched to the new layout for invoices.So I went ahead and made the change.  This then presented the exact issue that's being posted about here.  When I go the reminder list and select the edit and create when I review and send and then send once completed the reminder stays there. Nothing is updated.  The only other options are to create and skip.  I have used the skip because at least that does advance to the next date I need the reminder.  Looking forward to seeing if those are present on 10/1.  I plan on performing a few tests this month.

I just realized something and might be on to something but am not spending any more time with this today.  I was just looking at the list of reminders and realized that one of the previous dates was correct.  If I remember correctly what happened with that one (I was playing around to see if it worked) I chose to just create without edit.  It then disappeared from the list which was then alarming because I didn't want it sent without pertinent info for August transactions.  So, I had to go to the client, open the invoice, edit it, and then send.  I believe then this is the reminder that now shows the correct previous date and the next did advance.  I will play around with this during the week, trying to enjoy the holiday today.  Will report back.  But, if this is the case it's ludicrous.  To have to create an invoice then go to the client to find it and edit it and then send it.  Talk about creating more work.  Inefficient.