problem: when creating a group that is "approve to join" or "invite to join". After clicking on Group Forum, you get the not allowed to view this bored error message.

Solution:
go here
\components\com_comprofiler\plugin\user\plug_gjfireboard
open file showgroup.php
search for "if ( $result[0]->type > 1 && !( checkuseractive($groupid,$_CB_framework->myId()) || $admin ) ){"
should be aorund line 107

when calling the function
checkuseractive()
the first variable $groupid should be $groupId (capital I in Id)

I too was having problems with the plugin but after upgrading to the latest CB 1.2RC4 everything is working properly!

Hello Creator,
thanks for this info