I am using phpb4pl1 as a statically compiled module with apache 1.3.12.  I configured php as follows: 
CFLAGS="-O2 -DEAPI" \
./configure \
--disable-debug \
--with-mysql \
--with-unixODBC=/usr/local/unixODBC

The problem I am having is that the following script is not running as expected on my machine.  However, I know that this scripts runs correctly on a win98 box with phpb4 (or perhaps phpb4pl1, i'm not sure, it's not my box).

*********
<?

session_start();
if(!$m){
  echo "<br>registering m";
  $m="first time";
  session_register('m');  //only gets called the first time the page is loaded
}

echo '
        <html><head><title>test</title></head><body>
        <form action="me.php" method="post">
        new m: <input type="text" name="new_m"><br>
        set m: <input type="radio" name="set_m"><br>
        <input type="submit" value="submit">
        </input>
        </body>
        </html>
';

if($set_m){
  $m=$new_m;
  echo "<br>m: $m";
}else{
  echo "<br>m: $m";
}

?>

************
On my machine, everytime I click submit or reload the page, a new session is created instead of using the session created the first time the page is loaded.

The session related options from my php.ini file are as follows:

session.save_handler      = files
session.save_path         = /tmp
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     = 1
session.entropy_length    = 0
session.entropy_file      =
session.cache_limiter     = nocache
session.cache_expire      = 180

Thanks in advance.