i have installed version 2.3.10 and I have the same problem with login page,
session_start() [function.session-start]: open(/var/php_sessions/sess_fe155c02f4b61db93bdb6240db3848c7, O_RDWR) failed: No such file or directory (2) in file: /hermes/bosweb/web057/b575/ipg.mixmarketco/count/includes/session.inc at line 25
session_write_close() [function.session-write-close]: open(/var/php_sessions/sess_536fd33c655dc4e3bbb9e5aac6a57f1a, O_RDWR) failed: No such file or directory (2) in file: /hermes/bosweb/web057/b575/ipg.mixmarketco/count/includes/session.inc at line 83
session_write_close() [function.session-write-close]: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/php_sessions) in file: /hermes/bosweb/web057/b575/ipg.mixmarketco/count/includes/session.inc at line 83
session_start() [function.session-start]: open(/var/php_sessions/sess_536fd33c655dc4e3bbb9e5aac6a57f1a, O_RDWR) failed: No such file or directory (2) in file: /hermes/bosweb/web057/b575/ipg.mixmarketco/count/includes/session.inc at line 87
this text appear on the head of page...
i tried to change $go_debug variable in config.php to 1... the same problem