Topic: Code execution stops at register_shutdown_function('end_flush');

Hi all,

My setup for testing at was fine, and I didn't touch FA for months until today.
I found that I only got white blank space when I tried to access it today.

I tried to track at which line the execution stops. I found that it stops when it reaches:

register_shutdown_function('end_flush');

It is on includes/session.inc line 245. I use FA 2.3.3.
It's weird for me because it was okay months ago, and I didn't change anything on the code.

Did any body have similar experience about this problem?
Any help will be appreciated.
Thanks in advance.

Albert