Storyline Layer Trigger Doesn't Appear

Hello: 

I have been designing in Storyline for years and never had this problem. I have a slide with one layer for additional info. But, when I click on the Trigger icon, I only see Jump to Next Slide. 

I've attached the button and the menu pop up. It's the only button on the slide and I even deleted everything and started again, and still the same problem. 

Ideas?

Thanks!