Warning: Cannot modify header information -

Warning: Cannot modify header information - headers already sent by (output started at /home/redlinemedical/public_html/wp-content/themes/poloray-pro/functions.php:684) in /home/redlinemedical/public_html/wp-admin/post.php on line 197

Warning: Cannot modify header information - headers already sent by (output started at /home/redlinemedical/public_html/wp-content/themes/poloray-pro/functions.php:684) in /home/redlinemedical/public_html/wp-includes/pluggable.php on line 1195

I've made sure wordpress is up to date, its the current new polorray, I've removed all plugins, site works, admin area works, kind of, except that error shows up at every page update. I look at functions.php didn't see anything unusual, but I couldn't find a pluggable.php in includes?

the issue goes away when I change themes to the defaults.... any thoughts? thanks.