After further investigation, your first response is correct. There’s a fundamental conflict between layerslider’s popup with button functionality and the enfold theme. I found a satisfactory solution using a button the directs to an anchor and has the look of a popup. I prefer this solution to messing with the php at the potential expense of having to modify other elements of the site thereafter.

Thank you so much for your response; and I am overall very pleased with the theme and the level of support that your teams provides in these forums!