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Another update.

I had to deactivate the plugin on one of the sites as it broke my
site:

Warning: Cannot modify header information - headers already sent in /wp-includes/pluggable.php on line 896

line 896: header("Location: $location", true, $status);

	return true;

Sorry…

line 896 sorroundings:

if ( !$is_IIS && php_sapi_name() != 'cgi-fcgi' )
		status_header($status); // This causes problems on IIS and some FastCGI setups

	header("Location: $location", true, $status);

	return true;

Hi there,

sorry to hear that. And I really don’t know at all, what to do with it. I don’t touch anything with the plugin. I just use the hooks for the rss_excerpt and the feed_content to modify the output by putting an image in front of it.

Usually the headers already sent stuff comes, when a plugin is causing an error and actually wants to write some error code, while wordpress is busy doing something else.

When testing the darned thing, I work in debug mode with error logs on, to really retrieve everything, I possibly could do wrong.

https://esc-blogg.atelier-fuenf.de/feed works perfect with a clean errorlog in a multisite installation.

https://wasistlos.waldemarstoffel.com/feed works perfect as a single site setup.

Do you have anything running on one of those websites, that might interfere? Like hosting your images on a cloud service?