I have very frequent errors in my logfiles concerning the session data.  

"[07-Jan-2003 18:46:30] PHP Warning:  Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/tmp/php_sess) in Unknown on line 0"

Users are sometimes reporting a problem where sessions are not maintained but this is apparently *usually* transparent to the users and it is not often noticed.  

The obvious things are in place, there IS a directory /tmp/php_sess and it is owned by the webserver user.  I am using PHP 4.3.0 in safe_mode, as such:

session.save_handler = files                                                                                                                        
session.save_path = /tmp/php_sess                                                                                                                   
session.use_cookies = On                                                                                                                            
session.name = PHPSESSID                                                                                                                            
session.auto_start = 0                                                                                                                              
session.cookie_lifetime = 0                                                                                                                         
session.cookie_path = /                                                                                                                             
session.cookie_domain =                                                                                                                             
session.serialize_handler = php                                                                                                                     
session.gc_probability = On                                                                                                                         
session.gc_maxlifetime = 1440                                                                                                                       
session.entropy_length = 0                                                                                                                          
session.cache_limiter = nocache                                                                                                                     
session.cache_expire = 180                                                                                                                          
session.use_trans_sid = On   

I have apparently had this problem for quite some time dating back to 4.2.x.  

Please advise if there is anything I can try or do?  I have read through the other similar bug reports that do exist but they all refer to version 4.2.3 and earlier and say the issue is solved in "later version" or "snapshot".  

Is this still a known issue in 4.3.0?  

Thanks.