Guests and Forum Permissions driving me crazy

[Light Inspired]

I have a couple problems and I'm seriously at my wits end with them.

The first problem is that I have a ton of guests, well not a ton but my forum is for paying subscribed members only. There are constantly guests on there that are able to see information because I can see the thread they are browsing. I swear I have the permissions set correctly. How do I get rid of them. And what does it mean to resolve the guests IP address?

Second is my permissions are always acting up. For example certain members paid to take a Film class. I create the subforums for it. I create a usergroup for the film people. I deny all access to the subforum except for the film user group. Other members, not all, can still see it.
I had to go in individually and deny them access. That is just to tedious and I can't be sure all are being honest they can see it.
I thought the problem was fixed until I created a second workshop for business and half of the film people can see it.
Or like today a few members needed to have their posts moderated. I haven't changed anything on the admin. It's getting really frustrating. Any help would be greatly appreciated.

I'm running 4.2.0