Error on start-up after installation of 5.4.2

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I received the following error lines at the top of page in the initial start-up of my site this morning and was wondering if anyone knew how to correct this. Thanks for any assistance!

Warning: session_start() [function.session-start]: open(/tmp/sess_3b8e1902b6e9eaef2b5ebbfa9bc3985c, O_RDWR) failed: Permission denied (13) in /home/xaviour/public_html/concrete/startup/session.php on line 18

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/xaviour/public_html/concrete/startup/session.php:18) in /home/xaviour/public_html/concrete/startup/session.php on line 18

Warning: Cannot modify header information - headers already sent by (output started at /home/xaviour/public_html/concrete/startup/session.php:18) in /home/xaviour/public_html/concrete/libraries/view.php on line 791

 
Xaviour replied on at Permalink Reply
Actually, this is only showing up on Firefox 6, not on my Chrome or IE9. Strange.
freestylemovement replied on at Permalink Reply
freestylemovement
Hmm, i'm having the exact same issue. only in FF, not safari or chrome. does it happen everytime since you've updated now?