DONE!

Appreciate the response and interest in resolution.

I can but it may be useless at this point. After I made the post, I got the bright idea that maybe a plugin was as fault.

I then went to the plugin folder and removed  several plugins. The result was the problem I posted had disappeared. As I was more interested in making the issue go away, I don't know which plugin may have been causing the issue.

In the future, I will add plugins one at a time which will provide a better opportunity to see if it works.

Tks

I have a new install of Piwigo. I have added some plugins. I have created one album but no images uploaded.

With any change in configuration or selection choice, I am getting a Controller window that displays:

User
Theme
Language

Don't Hide SQL
Debug Language
Debug Template
Don't Combine js&css
Don't save to visit history

Below the display area, I am getting:

[13]

SELECT
  id, name, permalink, nb_images, global_rank,
  date_last, max_date_last, count_images, count_categories
FROM piwigo_categories INNER JOIN piwigo_user_cache_categories
  ON id = cat_id and user_id = 1
WHERE
  1 = 1
;
(this query time : 0.001 s)
(total SQL time  : 0.005 s)
(total time      : 0.092 s)
(num rows        : 1 )[14]

SELECT
    c.*,
    user_representative_picture_id,
    nb_images,
    date_last,
    max_date_last,
    count_images,
    count_categories
  FROM piwigo_categories c
    INNER JOIN piwigo_user_cache_categories ucc ON id = cat_id AND user_id = 1
  WHERE id_uppercat is NULL
   
  ORDER BY rank
;
(this query time : 0.000 s)
(total SQL time  : 0.006 s)
(total time      : 0.104 s)
(num rows        : 1 )[0.104 s, 14 queries] : end include/category_cats.inc.php

[15]

SELECT mail_address
  FROM piwigo_users
  WHERE id = 1
;
(this query time : 0.000 s)
(total SQL time  : 0.006 s)
(total time      : 0.117 s)
(num rows        : 1 )