Let’s hold off on doing anything more until the support staff get back to me: yesterday I observed several more loading errors with your updated version of the plugin, and the logging may’ve given them additional clues. I’ll be in touch once I hear from them.
Sure appreciate your continued support! I’m pretty sure that it has to do with a setting on WPEngine, but given they are a huge WP provider it’s worth figuring it out for everyone involved.
Jim P.