Removal of the Black Screen at the start of the Articulate Storyline Module

Hello,

I am currently publishing an eLearning course for my company that includes six Storyline files. All six files have been uploaded to our LMS (a very old system, just FYI). The first of the six, the "intro" course, is displaying a black screen with a play icon that requires the user to click it in order for the lesson to begin playing. I would like to get rid of that black screen and have the lesson begin playing without the user needing to click the play button.

The other five lessons do not exhibit this behavior. Our LMS will only work for our users if they are using Firefox, so that is the browser we are dealing with. 

I have been checking out some other forums for this issue. One was saying that having media (audio/video) on the first slide can cause the black screen to appear. My first slide did have audio, so I tried to create a "dummy" first slide with nothing on it and a trigger to automatically jump to the first slide of my intro lesson when the timeline begins. Despite that effort, I am still seeing the black screen with the play button. 

Any help is appreciated, thanks in advance!