[UPDATE] More SQL query updates to remove excessive (unused) column requests.
[FIX] Viewing Private Messages when the discussion has reached its maximum number of replies will display a notice, and no longer displays the quick-reply box, or reply buttons.
[FIX] Members attempting to create new Private Topics (PT/PM) when their account does not have permission, no longer displays an "action disabled" message. The member is now told their account requires a higher access level.
[FIX] Private Topics (PT/PM) now respects "Display Member Avatars With Posts," and will hide them when disabled.