If you want something more than a guess, post the file.
My first guess is layers set to no-plot.
Rob,
I understand is difficult to help me without a file.
It complicated to post the file.
Because I have to post 2 file and my main project is more than 5Mb.
there isn't anything wrong the layer states and the plot style table.
Actually I see all object in the paper space, it perfect!
But when I plot is missing some objects.