Topics posted in proteceted forums don't seem to be protected any more since other users can view and read these posts through the poster's user-profile. Any solution?

When displaying the profile, it takes into considering who is viewing the page to determine which forums to pull posts from. Have you tested this by logging on as a regular user? If you look at your profile, it is using your forum permissions to decide which posts it can see. If you log on as a member and view your (Admin) profile, it will use the member permissions to see what posts the Admin made.

Honestly I never thought of that. I will have to create a temp. username and see. Thanks for the heads-up.