I have four sites. I'm getting two different errors. These sites worked great ... but are not now. They are running 5.4.1.

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Two sites get the following when I attempt to go to the site:

Warning: session_start() [function.session-start]: open(/tmp/sess_298418ba11311d7cf690a6fe882c7dcf, O_RDWR) failed: Permission denied (13) in /home/jimmyphi/public_html/updates/concrete5.4.1/concrete/startup/session.php on line 18

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/jimmyphi/public_html/updates/concrete5.4.1/concrete/startup/session.php:18) in /home/jimmyphi/public_html/updates/concrete5.4.1/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/jimmyphi/public_html/updates/concrete5.4.1/concrete/startup/session.php:18) in /home/jimmyphi/public_html/updates/concrete5.4.1/concrete/startup/session.php on line 18

Warning: Cannot modify header information - headers already sent by (output started at /home/jimmyphi/public_html/updates/concrete5.4.1/concrete/startup/session.php:18) in /home/jimmyphi/public_html/updates/concrete5.4.1/concrete/startup/url_check.php on line 19

Warning: Cannot modify header information - headers already sent by (output started at /home/jimmyphi/public_html/updates/concrete5.4.1/concrete/startup/session.php:18) in /home/jimmyphi/public_html/updates/concrete5.4.1/concrete/startup/url_check.php on line 20

Warning: Unknown: open(/tmp/sess_298418ba11311d7cf690a6fe882c7dcf, 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

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Two other sites get this:

Warning: session_start() [function.session-start]: open(/tmp/sess_42cf842eb669fcedb856cc92b2056f02, O_RDWR) failed: Permission denied (13) in /home/bishopde/public_html/updates/concrete5.4.1/concrete/startup/session.php on line 18

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/bishopde/public_html/updates/concrete5.4.1/concrete/startup/session.php:18) in /home/bishopde/public_html/updates/concrete5.4.1/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/bishopde/public_html/updates/concrete5.4.1/concrete/startup/session.php:18) in /home/bishopde/public_html/updates/concrete5.4.1/concrete/startup/session.php on line 18
An unexpected error occurred.

mysql error: [1: Can't create/write to file '/tmp/#sql_285b_1.MYI' (Errcode: 13)] in EXECUTE("SHOW COLUMNS FROM `btNavigation`")

Warning: Unknown: open(/tmp/sess_42cf842eb669fcedb856cc92b2056f02, 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

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Any ideas?

Thanks in advance for you help.