Randy, getting rid of invisibility does not address the question of shadowing another member. If someone is so inclined, he can do it by simply logging out. Then there will be no record of what he viewed.

And, for that matter, I don't see shadowing as a problem unless it is being done to harrass that member (eg: posting a negative reply whenever he says anything). Of course, if someone does do that the posts that he makes are proof of what he has done.

If what Mary2E has posted is correct ("for no apparent reason except to make it easy for the mods/admins to see when someone last logged in"), I again can not see the advantage in it. Why do mods/admins have to know when I last logged in? If I have not violated the TOS -- which would be impossible without my either posting or sending a particularly vile PM -- there is no need for anyone to know when I have been on line. If I have violated the TOS, my action itself provides the proof.

The last issue is the one you raised about a member ignoring a PM and claiming that he never got it. That is, of course, possible but to carry it off the member would have to effectively give himself a permanent ban.

I am in invisible mode right now. If I get a PM I will see it. If I claim not to, the simple fact that I made this post (which is time stamped) is proof that I was logged in. If I am willing never to post again just to ignore that PM I can not be doing anything which will cause the mods or admin any trouble.