Dataview not rendering - at all

What I’m trying to do

Just trying to make dataviewjs render, anything would be nice. For example, even the following has no result.

dv.header(1, "🔥 DataviewJS Test");
dv.list(["Alpha", "Bravo"]);

### Things I have tried

To be clear, this is only happening in my main vault. At this point I'm more curious than anything. One day everything worked, I was trying to list all my contacts and have header each time the last name letter changed, nothing too tricky.  Next day, having changed nothing, it stopped. 

### Tried
I started first turning off all plugins except dataview. No change. I reverted to  the standard build, rather than the insider build I was using.  Then finally I put the above code into a test vault I had, and it performed fine.  Same 1.8.10 runtime.
I searched all my settings, could not find anything I changed recently.

I would rather not move all my files to a new vault and setup all the plugins again. I'd rather figure out what's going on here.
Any ideas?

dataview

can you post the full contents of the simplest file that fails, and your dataview settings?

also have you looked at what happens in the console when you render a page with dataview in it? ctrl+shift+i