i've had similar problems and i'm yet to find a solution, some users appear online but others aren't and I can't find a reason why!
for instance two of the admins on our site can't see each other online! I can see some users but not others and theres general confusion between many users as to who really is online :S. I've walked through the entire install 4 times now and i can't see 1 fault!
I wonder if the problem is realted in some way.
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