Another follow up, OpenLP 2.9.3 uses the color of the OpenLP app itself as the color for the background on the monitor when playing an MP3. Changing the color scheme for Windows from light to dark for default apps, changes OpenLP to a darker color, thus changing the presentation monitors from white to the darker color (which I believe is what Raoul was talking about). If I change Windows to a high contrast dark color scheme then the OpenLP app becomes black, thus changing the presentation monitors to black. This is a work around to get a black screen when playing an MP3, but I hope when 3.0 is released OpenLP will just use a black screen when playing an MP3. What would be nice if I new anything about programming, I could possibly help to change this bug.
One other little bug I noticed is when OpenLP gets to the end of the MP3 it starts the song over again for just a few seconds, but long enough for the congregation to hear, if I don't hit the stop button first.