[eluser]Peng Kong[/eluser]
my error that caused the blank page is becuz my source of randomness (dev/random) isn't supported or correctly configured on my server.
on my local environment. it works cuz im not using *nix but windows which doesn't have a source a randomness so i ignore randomness.
juz on logging to "1" in your config and and check the error message. if you facing my issue it will turn up in the logs.