@martin

Thank you for the reply.

As I stated I have disabled all plugins except:

wpForo

wpForo - Blog Cross Posting

wpForo Embeds

wpForo Emoticons

I will try disabling extra wpforo plugins as well.  

My theme is divi so I will try switching to the default theme.

Hi @martin @alvina,

I am experiencing the same PHP error. Disabling all plugins except wpforo does not solve it. I have not changed any plugin files myself.

This is the error I get:

PHP Warning: session_start(): Cannot start session when headers already sent in /var/www/aeroea-kulinichi/wordpress/current/wp-content/plugins/wpforo/wpf-includes/class-notices.php on line 16

Looking into file [wpforo/wpf-includes/class-notices.php] and comparing it with an older wpforo copy at GitHub [ https://github.com/DediData/wpforo/blob/master/wpf-includes/class-notices.php ] there is one thing that makes me wonder if that could be something.

In my installation I see:

/**
* @return void
*/
private function init(){
if( !wpforo_is_session_started() && ( !is_admin() || (!empty($_GET['page']) && strpos($_GET['page'], 'wpforo-') !== false ) || (wpforo_is_ajax() && !empty($_POST['action']) && false !== strpos($_POST['action'], 'wpforo')) )) session_start();
}

But at GitHub its much shorter:

 /**
* @return void
*/
private function init(){
if(!wpforo_is_session_started()) session_start();
}

Could this be something?

Thanks!