When I activate the SEO plugin, I'm getting this error:
Warning: Cannot modify header information - headers already sent by (output started at /home/xxxxx/domains/xxxxx/public_html/themename/wp-admin/includes/template.php:1642) in /home/xxxxx/domains/xxxxx/public_html/themename/wp-includes/pluggable.php on line 876
WordPress version: 3.5.1
WordPress SEO version: 18.104.22.168
I've also tested it with a new and clean version of WordPress, with no plugins activated and with the twentytwelve theme. Same results with the error...
I've checked this thread, but don't like to make changes to the WP core files.
Any ideas what could fix this?