Redmine

While the setting of permissions works well the statistic of "who is online" is often wrong. (At version 1.6)

So bots and guests are often shown as reading threads they can't read. (I controlled that. They really can't but they are shown as if they have permission to do so.) Or members are shown to other members as "is reading a thread", an option that is usually shown to a guest when the member is reading a thread the guest can't read (while the registered member should be able to see WHICH thread the other member is reading.)

This is not a big problem but often leads to confusion.