issue with media grid

Hi there,

I use a media grid to display photos for my work. Previously, I could open up a picture and I could get to the next picture by clicking the arrow that shows up. I noticed that since I upgraded my theme, I’ve lost the function where you can click the arrow to get to the next photo. Right now, I’m having to click on the photo, close it and then open up the next one to see it.

any help would be appreciated on how to fix this.

Thanks,
Karen