Blanke pages on post.php but post actually publishes

Hi

I have searched around on here already but couldn’t find an answer to my problem.

All my posts are actually publishing but there are just a few errors.

– Without my plugin activated this appears at the top of my admin area:

Warning: Cannot modify header information – headers already sent by (output started at /home/delta88/domains/youknowyouloveme.org/public_html/wp-admin/includes/media.php:1250) in /home/delta88/domains/youknowyouloveme.org/public_html/wp-includes/functions.php on line 698

Warning: Cannot modify header information – headers already sent by (output started at /home/delta88/domains/youknowyouloveme.org/public_html/wp-admin/includes/media.php:1250) in /home/delta88/domains/youknowyouloveme.org/public_html/wp-includes/functions.php on line 699

– When I activate my plugins this appears:

Warning: Cannot modify header information – headers already sent by (output started at /home/delta88/domains/youknowyouloveme.org/public_html/wp-admin/includes/media.php:1250) in /home/delta88/domains/youknowyouloveme.org/public_html/wp-includes/pluggable.php on line 850

Warning: Cannot modify header information – headers already sent by (output started at /home/delta88/domains/youknowyouloveme.org/public_html/wp-admin/includes/media.php:1250) in /home/delta88/domains/youknowyouloveme.org/public_html/wp-includes/pluggable.php on line 850

– When I make a post the post.php page is blank, but the post actually publishes on my site (http:://www.youknowyouloveme.org)

I have just updated to 2.7 as the past 2 days I was just getting plank pages.