headers already sent … pluggable.php on line 876

  • Got ‘headers already sent … wp-includes/pluggable.php on line 876’ error (no info about where output started) after last update today.

    The problem occurs to URLs without ending slash only. E.g. if I point my browser to ‘mysite/blog’, WP tries (I guess that) to perform redirect to ‘mysit/blog/’ and I see this message over the blank page. URL ‘mysit/blog/’ works fine. Disabled WP SEO and everything is back to normal.

    WP 3.5.1, WP SEO 1.4.9

    https://www.ads-software.com/extend/plugins/wordpress-seo/

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  • Here also, no url without / works.
    Also, all /rss/ url’s have stopped working.
    And, the site without www gives a blank page…

    And when I try to disable the plugin my whole website turns blank.
    This is on 4 websites, all after the update of de SEO plugin.

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