When I save my project, and then open it, it comes up with a blank screen. I then have to pick a layer and Zoom to, in order to see it ,including Bing Satellite Imagery.
When you open the project, are your layers listed in the left side panel? With Manifold you can have many, many layers. And in a project you can have many maps combining those layers in different ways. So when you open a .map file you have to choose what you want to look at or work on, whether a layer, some layers or one or more maps.