SESSION TROUBLE...

Hi everyone, i have a tricky situation here... I'm working on a project that requires session for logins. The problem is PHP DOES NOT generate a new session id, even if the appropriate functions are used. I have a little login test site that worked absolutely perfect, with sessions generated at EVERY login. At logout, the session is destroyed and DELETED from HDD. When i login again PHP generates THE SAME session string. How come PHP does this all of the sudden, when I did not make modifications to my php.ini ? Does anyone know how come this happens ? PLEASE send me some help. I really appreciate it ! Thank you so much ! I use PHP 4.2.2 under Apache 1.3.22 as module, on XP Proffesional. My config in php.ini : [Session] session.save_handler = files session.save_path = /php/sessions session.use_cookies = 1 session.name = PHPSESSID session.auto_start = 0 session.cookie_lifetime = 0 session.cookie_path = / session.cookie_domain = session.serialize_handler = php session.gc_probability = 1 session.gc_maxlifetime = 1440 session.referer_check = session.entropy_length = 0 session.entropy_file = ;session.entropy_length = 16 ;session.entropy_file = /dev/urandom session.cache_limiter = nocache session.cache_expire = 180 session.use_trans_sid = 1 url_rewriter.tags = "a=href,area=href,frame=src,input=src,form=fakeentry"