I got something to work. Here is a gist of “registering the taxonomy” and adding the taxonomy filter to the filter bar all in functions.php: https://gist.github.com/chrisdigital/42ba864f9d11090627fe
Backup your database and functions.php file before messing with them.
(Do not use another plugin to create taxonomy, just do it “manually” as I show here – I ran into problems using a plugin and just eliminated that as a problem after restoring my database.)
I hope this helps someone else.
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This reply was modified 10 years, 9 months ago by
Christopher. Reason: Posting resolution