By default ~Sedna Presenter Player will display the Presenter Logo in the background. 

When crossfading media this logo might appear visible beneath content. 

To replace the Sedna logo with a black background, follow these steps:

  1. Download BlackBackground.png attached to this support article. 
  2. Quit the Presenter Player Application by pressing Command + Q
  3. Click on Displays
  4. Select the display on the left hand side which is checked as "Enabled"
  5. Click Display on the right side of the window
  6. Click "Browse Image" and navigate to the location in which you downloaded BlackBackground.png
  7. Click Start Player