Description:
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I've tried everything (I think), and can't get PHP to store any session data.  I specified a session data directory that the web server has read/write permissions for, and the session arrays get modified on the page where the variables are set, yet nothing gets written to disk (and therefore not passed to any other pages, from which I can't reference the variables).

PHP.ini settings:
session.save_handler = files
session.save_path = c:/temp
;note: "c:\temp" and "/temp" etc. also do not work
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.cache_expire = 180

Reproduce code:
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[test.php]
session_start();
$_SESSION["test"] = "test";

echo $_SESSION["test"];
//works fine, but when referencing in any other file
//(via redirect or anything else)...

[test2.php]
session_start();
echo $_SESSION["test"];
//returns nothing