"Pages" or "All Pages" from dashboard menu shows empty white page

All appears to be working fine in frontend and backend of site, except Pages, when clicked from Dashboard menu.

‘…/wp-admin/edit.php?post_type=page’ is the link construction causing the issue.

It always comes up with a blank white page. There are over 7,000 pages on this site. I’ve tried increasing memory using: php.ini (containing memory_limit = 256M),

and by editing wp-config.php to contain:

/** increase memory limit */
define('WP_MEMORY_LIMIT', '256M');

Neither is working.

Please help, thanks…