Have not tried
FreeBSD 6.0-RELEASE-p15, Apache 2.0.55, mysql 5.0.19
- create a project.
- config a anoymous user.
- assign the anoymous user to the project.
- use the anonymous use to view the project's tasks.
- in list view, can see tasks.
- then turn to tree view, no tasks showed.
I think, the anonymous user can view a projects' tasks in tree view.