Annoying issue right out of the gate – demo content won't load

When trying to include sample content with the demo theme layouts, it will not give me the option to continue. Pop up screen says “Install the full demo –
Are you sure you want to install the full demo? This will import homepages, sample content with images, backgrounds, template layouts, fonts, colors…” but there is nothing to click!

There appears to be a space where a “yes or no” dialog should be but there is nothing there, no way to click and proceed.
When I attempt to load a demo without the content, the popup box works fine and has a Yes or No selection that works.

Have ensured all of my php settings for max upload, max time, etc are correct. Have tried multiple browsers including IE.

Surely I’m not the first one to experience this!