[Plugin: Fast Secure Contact Form] "Warning: session" error with FS Contact Form

I’ve been getting the following warning(s) in the header and footer in one of my websites:

Warning: session_start() [function.session-start]: open(/tmp/sess_9177d7108cdc5024749301f5ead1ed06, O_RDWR) failed: Permission denied (13) in /home/ocdi/public_html/site/wp-content/themes/yoo_balance_wp/warp/systems/wordpress/helpers/config.php on line 48

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/ocdi/public_html/site/wp-content/themes/yoo_balance_wp/warp/systems/wordpress/helpers/config.php:48) in /home/ocdi/public_html/site/wp-content/themes/yoo_balance_wp/warp/systems/wordpress/helpers/config.php on line 48

and in the footer:

Warning: Unknown: open(/tmp/sess_9177d7108cdc5024749301f5ead1ed06, O_RDWR) failed: Permission denied (13) in Unknown on line 0

Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/tmp) in Unknown on line 0

Hostgator led us back to the FS Contact Form plugin, which I deactivated and it seemed to clear it up for some computers.

Since I love this plugin and have used it on sites before, anyone have any idea what could be causing this?

http://wordpress.org/extend/plugins/si-contact-form/