I also had this problem after installing v3.4.1,
Warning: Cannot modify header information – headers already sent by (output started at /home/palintre/public_html/wp-content/themes/elogix/framework/functions/shortcodes.php:1) in /home/palintre/public_html/wp-includes/pluggable.php on line 881,
im using elogix theme, please help how to fix this
thank you very much