Try this. In PPro, drag an imported clip from a bin to the lower right hand corner of the bin and drop it on the 'new item' icon. This will make a new sequence from the clip that matches the clip. Then when you export, select 'match sequence settings' checkbox - that should be all you need to do. Now render. Does it still show black at all? It shouldn't. My guess is that there is a difference in pixel aspect or something between your sequence and render settings.