I have changed the theme to match my other site, which works.

Identical themes.

Both with several errors when run thru the W3 Validator, yet the other site works, and this one does not.

The only differences are the content and widgets.

I even tested a theory and added a supposed missing closing div tag. It eliminated one error in the validator, but remains broken.

I re-unzipped and re-uploaded the theme so it’s “fresh” and right out of the box.

Site is still broken.

AGHAGHGHGGGG!!!!!

I’m hella pissed.

At this point I am [thisclose] to just backing up my damn database and wiping the site and installing it all over again.

Excuse me while I go bang my head against a wall.

I fixed it.  Weird stuff indeed.