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Scuse me, but I think that simple, THIS IS A BUG!
This feature don't work properely!
I must to have so much traffic for have a feature that work?? This is an answer for you??!!
If the "Who's online" is a good block, he must to work with little o big traffic, this is the truth.
From many times a lot of users of XOOPS have this problem and a solution where is???
NOTHING, NOTHING, NOTHING.
It's possible that the development team don't correct this bug??