Warning: Cannot modify header information error message
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After upgrading to WP 3.8, I noticed that a public the page with [catlist] shortcode displayed an error message:
Warning: Cannot modify header information – headers already sent by (output started at /home/invivoan/public_html/wp-content/themes/simplebusiness_v1_1/header.php:2) in /home/invivoan/public_html/wp-includes/pluggable.php on line 896
In case the problem was with the theme, I loaded the new Twenty Fourteen theme and the error message is:
Warning: Cannot modify header information – headers already sent by (output started at /home/invivoan/public_html/wp-content/themes/twentyfourteen/header.php:13) in /home/invivoan/public_html/wp-includes/pluggable.php on line 896
When I take away the sections with the [catlist] shortcode, the page loads.
Yet somehow, the page with [catlist] loaded fine if logged in as admin. In case it matters, site access is controlled uses the Member Access plugin Version 1.1.6 by Chris Abernethy.
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