seems like the problem is solved ........ but then ....... ok ... let's see if somebody knows how to solved this .
1) log in as a member in the forum, then post new topic. Without doing the manual deleting of cookies , the new post topic cannot be seen even you refresh for 1000 times.
2) Log out from the forum and log in back as a different user , go back to the topic that previously post . The user is still the first time user , not the second user. Have to do the deleting of cookies again ........
Not really sure others faced the same problem as mine or not. But that is the problem that i faced for quite a long of time already . Until lots of my members are not coming back .