I am seeing them when using the "who is online" button. the activity will say something like "making a reply", "viewing user profile" or "reading a forum in flat mode." It is always the same IP. We do not have enough threads for this someone to be reading away - we dumped all the old threads so there is less than 200 threads. By now, the have been read by this IP a dozen times over.

Is it possible that this same IP is appearing when a user is loggin in our out? A second one appearded as anonymous yesterday and then the IP was identical to an approved user. It also showed the user in the "who is online area" at the same time the IP was in anonymous - but this was different than the IP that appears all the time.