I have set up a show to 1600-1000px. My screen resolution is set to 1600-100px. When I run the show, I does not fill the monitor left to right. It fills top to botton , but left and right there is black. Any ideas?

Do you have your slide orientation set to Landscape?

Maybe the projector is set to a different aspect ratio. Does it look squashed? Sounds like a D1 vs. NTSC video issue to do with the projector. I would look for aspect ratio setting on the projector, but it's only a guess.