Within that i have a private forum that is used by about 70 of the members . I set it up then added the members manually using the Allow tab under permissions.
Every few days someone seems to lose access and can't see the forum any longer, I have to go in click on revoke save and then reclick on apply then they can see the node again.
This seems totally random and isn't linked to when their subscriptions renew
here are the permissions used: