I've created an Engage 360 interaction, imported it into Storyline 360, published to Review 360 and inserted it as a Storyline block in Rise 360 duplicating the steps Jen posted in her follow up post for the same issue here. I launch her sample in Chrome and the play button is gone.
In Chrome, with my sample, I am still seeing the gray circled play button, when the Engage Interaction loads. I have a slide placed right before it, with an image to click to next slide, and I'm still getting the play button. This does NOT happen in IE.