Hi john,
When you say
when i open any new saved song the song does not "automatically" play after being
double clicked on.
It loads in and all the instruments and chords and all are there but
i have to hit the play "arrow" to get the song to start.
In both 2015 and 2016 versions you can use the " transport bar " ( extreme left hand side ) or from the drop down menu " Play " to start your song playing.
I can not recall that in the 2015 version the song would " automatically " play. I still had to hit the play " arrow ' in the transport bar or go the drop down menu " Play " to start my song playing. Actually the drop down menu " Play " has far more choices and of course they are " hot key " coded. For example Command + A to play and generate a song. ( My comment: it still puzzles me how MR PG came up with using the letter " A " for play but i know that it has been that way for more then 30 years that i have been using this programme )
Anyways, those are my thoughts and more then likely completely missed your question/concern. Just blame it on Mr Magoo - (w)