1st I noticed my rss feed didn't validate due to 'Undefined root element: br' and 'XML parsing error: <unknown>:2:0: junk after document element'
FeedValidator.org shows this:
# <b>Warning</b>: session_start() [function.session-start]: open(/tmp/sess_bb9892a3929a3a09270bbecb67f53a19, O_RDWR) failed: Disk quota exceeded (122) in <b>/home/mysite/public_html/wp-content/plugins/wp-affiliate-platform/wp_affiliate_platform1.php</b> on line <b>8</b>
#
# <b>Warning</b>: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/mysite/public_html/wp-content/plugins/wp-affiliate-platform/wp_affiliate_platform1.php:8) in <b>/home/mysite/public_html/wp-content/plugins/wp-affiliate-platform/wp_affiliate_platform1.php</b> on line <b>8</b>
#
# <b>Warning</b>: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/mysite/public_html/wp-content/plugins/wp-affiliate-platform/wp_affiliate_platform1.php:8) in <b>/home/mysite/public_html/wp-content/plugins/wp-affiliate-platform/wp_affiliate_platform1.php</b> on line <b>8</b>
So my rss feed is invalid. Deleting this plugin fixed my rss feed.
Then starting today I was also getting critical error codes showing at the top of my public website:
Warning: session_start() [function.session-start]: open(/tmp/sess_cff502a4cc643b383d3b0ad749981717, O_RDWR) failed: Disk quota exceeded (122) in /home/mysite/public_html/wp-content/plugins/wp-affiliate-platform/wp_affiliate_platform1.php on line 8
Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/mysite/public_html/wp-content/plugins/wp-affiliate-platform/wp_affiliate_platform1.php:8) in /home/mysite/public_html/wp-content/plugins/wp-affiliate-platform/wp_affiliate_platform1.php on line 8
After deleting this plugin the errors went away.
I'm guessing that this plugin is not compatible with the latest version of WP since I didn't used to have these problems until recently.
WP 3.0.2 multisite