I just went to do that and things seem to have resolved. 

I did one restart last night and it had no effect on the game. I loaded the most recent  AutoSave slot; the image was of a empty solar system.  and when I loaded Pi3 Orionis was just a Star with no Planets. 

I did another restart this morning.

When I saw this message  I went to reload the autosave to make sure it was the correct one It took a loooong time to load up. When it was done everything was back.  I immediately re-saved and now the image shows a populated solar system.  

Thank you for your speedy response. I am loving the game so far.