Hi Ernest,
a quick update: if i disable “Override the default WordPress search results page” the order in the search page is correct (by custom field i.e. author name), except for empty field searches (which returns the whole catalog).
If I enable “Override the default WordPress search results page”, empty search performs correctly, but all searches (with empty or filled field) are ordered by title not by custom field.
Please give me some feedback.
Ilaria