Sorry to answer to such an old post, but it is on the subject I wanted to talk about.
Invisible users are shown in the last seen box, which makes it quite easy to see if they are on anyways. I'd say that this is very bad considering that they make themselves invisible for a reason, whatever that may be, and if they are still shown in some places this might be very upsetting.
I just noticed this because I turned myself invisible (I've gone into hibernation at the moment, need a break from some of my users...) and saw myself in the last seen box. Not that big of a problem for myself, but still something to consider.
If it is the fact that there'll be two different cache versions that is the major problem, my suggestion is to just have the one where invisible users aren't shown. They still show up for admins in the online pal which I'd say is sufficient.
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