Welcome to the forum. Unfortunately, you have posted to the Premiere Elements (separate program) Forum, and not to the PrPro Forum.
If you have PrPro CS 5 - CS 6, post here: http://forums.adobe.com/community/premiere/premierepro_current?view=overview
If you have PrPro CS 4, or Earlier, post here: http://forums.adobe.com/community/premiere/premierepro_previous?view=overview
For some PrPro Export tips, see this FAQ Entry.
The problem were indeed the project's Preset settings. I was looking at the opposite end of the job, so it took me quite a little time to find what it was. I changed the settings to something that looked similar to the source footage and now I don't have the black frame anymore.
Again, thank you for your help. Cheers!
This is quit common. The Project must match the Source Footage, as closely, as is possible.
Then, when edited, one would choose the appropriate Export/Share settings to get a final output, that meets their needs.
The one exception to this is when one is doing SlideShows, with Still Image ONLY, i.e. no Video. Then, they would look to the output, setup their Project for that, and Scale the Still Images to match that. Remember, that is with Projects, that have NO Video.
Good luck, and glad that the forum was helpful.