I use "Can see forum" permission as "Can read forum" one by mistake; while actually, they have different meaning. The result is: if one registered user has "Can see forum" permission of one restricted forum, but does not have "Can read forum" permission, he/she should be able to read the forum title, but should not read topic title/content within this forum. While through my module, the topic title/content is displayed there. (If you use default phpBB3 user group, which enables/disables "Can see" and "Can read" at the same time, you do not have this issue.)
I am very sorry for the trouble I made. Please update to Load 6.1 which includes the bug fix.
OPEN
"http://yoursite.com/includes/session.php"
FIND
if (isset($_GET['sid']))
REPLACE WITH
if (isset($_GET['sid']) && !defined('MOPHPBB3'))
For phpBB3 version 3.0.7-PL1 or before, the above change is not necessary.
The reason (for this updating) is when phpBB3 updates its operation/scenario from version 3.0.8, my code is incompatible with it.