Update suceessful message not showing up

[Cronos]

Hello people,

When I am trying to add/delete/modify anything in the backend, the screen comes to blank page.


http://www.mystore.com/admin13/index.php?tab=AdminContacts&submitAddcontact=1&token=8c198fd74d45fd56a4837db5bbb8f11c

And it does not show the update message.

I have to go back to see the backend again.

It works well on the local server.
The problem is when i uploaded it onto the production server.

Local server is my DMZ.

Thanks.