Same code, same server, but PHP session not working?

Jul 26, 2006
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I did a copy of some of my code from one folder to another in one of my servers. This folder is under a different domain with a different cert. The problem is on some pages the session_start(); in php does not appear to pick up the session and kicks me out (code thinking I am not logged in).

Same code, same PHP (which also works on my test server), and same htaccess. The main different: this folder is under an EV SSL. I plan on taking more troubleshooting steps later tonight, but any obvious ideas why this would happen?