Description:
------------
I just upgraded to 4.3.11 and installed Zend Optimizer.  I turned Zend Optimizer off to see if this was he cause of the problems - which it was not.
Web server is running:
Apache/1.3.33 (Unix) mod_perl/1.29 PHP/4.3.11 
Problem was just reported by a customer who istalled the aMember package on the server.  AFter much testing we isolate the problem to sessions.
Sessions is set to use files, in the /tmp directory, which has full access (777).  When I access a page which has session_start, I see that 2 session files are created.  Both have zero length.
Also, when I set session.autostart to 1 php pages return a page not found error.
Any assistance in tracking down the problem will be deeply appreciated.

session
Session Support  enabled  
Registered save handlers  files user  

Directive Local Value Master Value 
session.auto_start Off Off 
session.bug_compat_42 Off Off 
session.bug_compat_warn On On 
session.cache_expire 180 180 
session.cache_limiter nocache nocache 
session.cookie_domain no value no value 
session.cookie_lifetime 0 0 
session.cookie_path / / 
session.cookie_secure Off Off 
session.entropy_file no value no value 
session.entropy_length 0 0 
session.gc_divisor 1000 1000 
session.gc_maxlifetime 1440 1440 
session.gc_probability 1 1 
session.name PHPSESSID PHPSESSID 
session.referer_check no value no value 
session.save_handler files files 
session.save_path /tmp /tmp 
session.serialize_handler php php 
session.use_cookies On On 
session.use_only_cookies Off Off 
session.use_trans_sid Off Off 



Reproduce code:
---------------
<?
session_start();
phpinfo();
?

Expected result:
----------------
phpinfo will be displayed

Actual result:
--------------
page not found