Page 2 Messages Private
After some checking I came to the conclusion that the issue is on your end, you were probably being seen as a Guest by the server. That message you received is really a security message saying you are not allowed access to the messages.
Next time something like this happens please scroll to the top and see if it says "Abnninja" at the top of the page to ensure you are logged in and that your browser or connection is not blocking our host. This should be the same for other Members if they encounter something like this: make sure the site sees you as logged in.