Hello Arie.

This issue can come up if you have some caching plugins enabled, and/or security plugins blocking the admin-ajax calls from being completed.

You can try deactivating "Use minified wpDataTables Javascript" slider found in main settings of wpDataTables/Custom JS and CSS, and see if that helps.

If it doesn't, then my guess is you're using a complicated query, and wpDataTables server has problems with parsing of the query and building new queries dynamically (rarely happens, but does sometimes). To avoid this please prepare a MySQL view (a stored query), which will return the data that you need, call it e.g. “view1” and then build a wpDataTables based on a simple query like “SELECT * FROM view1″.

If you still cannot resolve the issue, please provide me a temporary WP-admin login for your site where this happens, so we could log in and take a look ‘from the inside’ as that’s the most efficient way to see and resolve the issue. We do not interfere with any data or anything else except for the plugin (in case that’s a production version of the site), and of course we do not provide login data to third party. You can write credentials here just check Private Reply so nobody can see them except us.