JoelSanchez

Solved, it was a faulty 301 redirection on my .htaccess:

RewriteCond %{REQUEST_URI} trabajos/.+
RewriteRule trabajos/(.*) /trabajo/$1 [L,R=301]

This was redirecting /trabajos/_index_ssl.html_gzip to /trabajo/_index_ssl.html_gzip, which does not exist, hence the error.

Now it is like this:

RewriteCond %{REQUEST_URI} trabajos/.+
RewriteCond %{REQUEST_URI} !_index.
RewriteRule trabajos/(.*) /trabajo/$1 [L,R=301]

Developers should be careful creating 301 requests when using W3TC, and make sure the redirections exclude this form:

_index%{ENV:W3TC_SSL}%{ENV:W3TC_PREVIEW}.html%{ENV:W3TC_ENC}

There was a typo (“&” instead of “%”):

$wcu_sql = "DELETE FROM $wpdb->posts WHERE post_status = 'draft' AND post_type NOT LIKE '%ngg_%' AND post_type NOT LIKE '%display_type%' AND post_type NOT LIKE '%displayed_gallery%'"