I've noticed that when the box in About Land > Options > Avatars on other parcels can see........ is unchecked there also appears to be vertical visibility limits for avatars in the same parcel. Here is the test, have two avatars in the same parcel, on above the other 60M vertical separation. Have one cam on the other and toggle the visibility check box and watch the cammed avatar disappear and appear. Just wondering if this is as designed, a side effect of the avatar visibility project, or a bug