Physical Model Disappeared

I have a large model created using the physical modeler. I turned the load values "on" in the view toolbar and the program crashed. When I re-opened it my physical model had disappeared. The analytical model appears to be there still, although not updated, and the command file is still accurate as far as I can tell. But there is no information shown in the physical modeler. No visual model, no nodes/members/surfaces in the tables or anything. How do I get my model back?