Warning all over my website

I've done upgrade of Buddypress, Wordpress and all my plugins. I left your until last, somehow I just knew it wasn't going to be smooth, I was right, the only one.

After the upgrade I got a warning :

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home1/charlie/public_html/dev/wp-content/plugins/buddypress-media/app/main/controllers/template/rt-template-functions.php:1) in /home1/charlie/public_html/dev/wp-content/plugins/buddypress-media/app/main/controllers/media/RTMediaViewCount.php on line 20

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home1/charlie/public_html/dev/wp-content/plugins/buddypress-media/app/main/controllers/template/rt-template-functions.php:1) in /home1/charlie/public_html/dev/wp-content/plugins/buddypress-media/app/main/controllers/media/RTMediaViewCount.php on line 20

If I look on the page, it gives me something similar :

Warning: Cannot modify header information - headers already sent by (output started at /home1/charlie/public_html/dev/wp-content/plugins/buddypress-media/app/main/controllers/template/rt-template-functions.php:1) in /home1/charlie/public_html/dev/wp-content/plugins/wp-super-cache/wp-cache-phase2.php on line 88

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home1/charlie/public_html/dev/wp-content/plugins/buddypress-media/app/main/controllers/template/rt-template-functions.php:1) in /home1/charlie/public_html/dev/wp-content/plugins/buddypress-media/app/main/controllers/media/RTMediaViewCount.php on line 20

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home1/charlie/public_html/dev/wp-content/plugins/buddypress-media/app/main/controllers/template/rt-template-functions.php:1) in /home1/charlie/public_html/dev/wp-content/plugins/buddypress-media/app/main/controllers/media/RTMediaViewCount.php on line 20

I've had no option but to deactivate it.

Any ideas?

Can you please update to the latest version 3.2.2 ? Let us know if you are still facing the issue.