Problems viewing a Revit model

Hello.
I have problems viewing a Revit model, in the plugin tab, when I start D5, the program runs, but the model does not appear or I cannot see it or manipulate it.

Hi! Will the model appears in the Object List on the left sidebar? Could you show me a screenshot of D5 user interface where the program runs, but the model does not appear or you cannot see it or manipulate it? And what version of Revit and the Revit plugin you use?