Very interessting...

Description

It looks like this is a problem with user rights. Obviously a bug:
  1. The task is been displayed in lists (although it should be hidden)
  2. When directly accessing the task, the access is rejected and the user is sent to home / loginForm.
I have to figure out two points:
  1. Why can the guest see the tasks at all (you should have to publish them)
  2. Why is he sent to loginForm instead of home
You could help be providing following information:
  1. Which user rights does the anonymous use have? Please go to edit user rights and list the checked options.
  2. Which projecs rights in the project does he have? Go the Project View, select the anonymous user in team list and use the edit icon.
thanks for you help