Gradient added to slide when publishing in Presenter

I published a presentation in Articulate Presenter and for some reason, when i publish (or preview) a slide with a dark background publishes with a white gradient in the middle of the slide.  I tried tweaking the background colors in the player settings but still have the same issues. 

Here's how the slide looks as designed:

When I preview the slide (or publish), it looks like this:

Anyone have any ideas?!