This morning, i logged in to ACP of Indonesian Linux Forum and i saw a notifications that the version used in the forum is out of date. Seems that phpBB 3.0.1 has been released and has fixed quite a numerous problems found on the first release of phpBB 3.0.0.
I download the changed files and upload them to the servers and running the upgrade process and when everything is done, i must re-add the MOD (yes, most of the MODS are overwritten ). After few minutes of down time, i re-enabled the forum again (it's a good idea to disable the forum while doing maintenance) and sent a notifications to all users.
I hope it's OK right now and enjoy the new forum (you may not notice the difference though but if you are interested what has been changed, you might want to see this thread)