The 3ds max section is a subforum of Mafia Productions which is open for everyone. You should have no problems viewing it. I tested in my regular alt. If you can't access it send me a screenshot.
As for the other subforum, that might be a special section requiring special permissions. Even though you have access to the White Hat Activities you may not have the permissions needed.
@Don Von Alpha Dom
set the permissions for that area and might know a bit more.