Cannot open or access content of nested asset folders

I'm at a loss as to why this is not working.

I'm building out a site with an events page. Each event has several images associated with it. In the Assets Library, I created a folder called Events. I then created 8-9 sub-folders for the various events and moved the images from the root of the Assets Library into their respective folders.

Now I'm trying to open the sub-folders but cannot. I thought I could "spin down" the arrow next to the Events folder but I cannot. 

I'm on a Mac and I've tried Chrome, FF and Safari - both regular and incognito. I cannot see any image in any of these directories. And now that I've moved the images from the root and into a sub-folder, I cannot access the image to move it back to the root. WTF?

Am I missing something? How can I create folders and sub-folders, move content into them and then not be able to see the content?

You should be able to double-click on folders to see inside them:

Gawd! Thanks for that. Double clicking? Who would have thought?