Answers:
1. Nowhere. Because this was an upgrade, there were missing theme settings. Whatever "themes" are.
Anyway, without a theme, the background was black and the letters were still very, very dark gray.
Poor choice of default. With letters defaulting to near-black, the background *MUST* default to something
with a little contrast.
2. I'd still like to know.
3. Haven't resolved that one yet. Somewhere there's a setting to make window backgrounds be opaque.
That should be the default (continuing familiar behavior). Then, you can prominently display "Hey!
There's a cool new feature to allow window background to be translucent so you can see what's
behind it." It detracts significantly to be unable to use the app itself because all you can see is the
underlying background.