Hi Chris,
Thanks for the help, with it I was able to isolate the issue to the .htaccess file.
I had manually adjusted the file according to instructions from the ‘Better WP Security’ plugin, specifically their Hide feature that obscures the backend. The .htaccess rules cause the issue with mashups, not standard mappress maps.
Here is the .htaccess code, perhaps you know something of how it may be amended so that the conflict does not occur. I’ve currently disabled the feature and removed the code so that the mashup functions as expected.
<Code>
<IfModule mod_rewrite.c>RewriteEngine OnRewriteRule ^login/?$ /wp-login.php?abcdefghijklmnopqrstu [R,L]RewriteCond %{HTTP_COOKIE} !^.*wordpress_logged_in_.*$RewriteRule ^admin/?$ /wp-login.php?abcdefghijklmnopqrstu&redirect_to=/wp-admin/ [R,L]RewriteRule ^admin/?$ /wp-admin/?abcdefghijklmnopqrstu [R,L]RewriteRule ^register/?$ /wp-login.php?abcdefghijklmnopqrstu&action=register [R,L]RewriteCond %{SCRIPT_FILENAME} !^(.*)admin-ajax\.phpRewriteCond %{HTTP_REFERER} !^(.*)dewandelaar.nl/wp-adminRewriteCond %{HTTP_REFERER} !^(.*)dewandelaar.nl/wp-login\.phpRewriteCond %{HTTP_REFERER} !^(.*)dewandelaar.nl/loginRewriteCond %{HTTP_REFERER} !^(.*)dewandelaar.nl/adminRewriteCond %{HTTP_REFERER} !^(.*)dewandelaar.nl/registerRewriteCond %{QUERY_STRING} !^abcdefghijklmnopqrstuRewriteCond %{QUERY_STRING} !^action=logoutRewriteCond %{QUERY_STRING} !^action=rpRewriteCond %{QUERY_STRING} !^action=registerRewriteCond %{QUERY_STRING} !^action=postpassRewriteCond %{HTTP_COOKIE} !^.*wordpress_logged_in_.*$RewriteRule ^.*wp-admin/?|^.*wp-login\.php /not_found [R,L]RewriteCond %{QUERY_STRING} ^loggedout=trueRewriteRule ^.*$ /wp-login.php?abcdefghijklmnopqrstu [R,L]</IfModule>
</code>