Loading Session Class Cause Blank Screen

[eluser]Allie Syadiqin[/eluser]
Hi all. I have a working CI 1.7.2 and it works perfectly using the Hybrid Session alternative library. Today, I moved the entire site to an Amazon server and now I have a blank screen. There are no errors shown on screen or the logs (display_error is ON, CI logging set to 4, etc..). I tried setting the CI back to the default settings, ie. Welcome.php, welcome_message.php, and it still won't display anything. I then tried removing the autoload config and the only time the page load is when I removed the session library. So basically, the session library/class is the cause of the problem.

I have also tried to use the native CI Session library but still getting blank page. Is there anything that might cause this to happen or did I forget to configure anything in the server's PHP settings? Any help is appreciated. Thanks.