Faulty Archive Widget

My site is self-hosted. I’m using the Selah theme, and the archive widget I’m using is the standard WordPress widget.

The problem is no search results are provided. This happens no matter the month/year selection. It appears to be searching as I can see the browser tab chugging away (Google Chrome browser). When it completes its search, it sits on whatever page I was using prior to attempting a search. Nothing has changed.

I have tried other archival widgets produced by several different plugins, all of which had been tested with the Selah theme. They provide the same results — nothing.

Open to suggestions. And thanks!