I only changed it once, AFTER that black bar appeared.
Taxes were yesterday, and the site worked after that. Today I was checking Group Modifications. That wouldn't do it either. Here's the logs screen.
Like I said, I changed the theme AFTER the black bar showed up.
If I had a recent backup, I would of tried it. But I don't.
I'll also say, everything in the admin is still there. products, sales, everything.