I've run up against a weird problem while writing a custom wp_query. I'm using author_name, tax_query and meta_query.
Individually, my author_name parameter works.
My tax_query parameter works.
My meta_query parameter works.
In combination, my tax_query and my meta_query parameters work when both specified;
my meta_query and author_name parameters work when both specified.
But when an author_name AND a tax_query are both specified, I get an empty set, even when there should be posts. Has anyone seen this before, and is there something I should look at to see what's causing these two parameters to be incompatible?