I found that when I click on Administration > Users ... there are only one users with blank user name.
And all client will have administration menu, all system show now error submitting ticket, reply, close ticket is working just fine.
It's seems like the AD integration for users doesn't work ... Please advice regarding this issue.
The ADGroups.xml show all of my AD group correctly.
Thanks and Appreciate ... this is an awesome jobs after all. One and only on the net !