tempted atcd
More investigation:
I went to the error log on the site and the following appeared right after I tried to log in to the admin page.
PHP Warning: Unknown: open(/var/php_sessions/sess_72ee26fac8f62b47f1c36b6a6d903749, O_RDWR) failed: No such file or directory (2) in Unknown on line 0
PHP Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/php_sessions) in Unknown on line 0
PHP Warning: Unknown: open(/var/php_sessions/sess_72ee26fac8f62b47f1c36b6a6d903749, O_RDWR) failed: No such file or directory (2) in Unknown on line 0
PHP Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/php_sessions) in Unknown on line 0
PHP Warning: session_start() [<a href='plugins/function.session-start'>function.session-start</a>]: open(/var/php_sessions/sess_72ee26fac8f62b47f1c36b6a6d903749, O_RDWR) failed: No such file or directory (2) in /hermes/bosweb/web166/b1662/ipw.missouriusbc/public_html/PowerGallery/WA_SecurityAssist/Helper_PHP.php on line 5
PHP Warning: Unknown: open(/var/php_sessions/sess_72ee26fac8f62b47f1c36b6a6d903749, O_RDWR) failed: No such file or directory (2) in Unknown on line 0
PHP Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/php_sessions) in Unknown on line 0
PHP Warning: Unknown: open(/var/php_sessions/sess_72ee26fac8f62b47f1c36b6a6d903749, O_RDWR) failed: No such file or directory (2) in Unknown on line 0
PHP Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/php_sessions) in Unknown on line 0