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When I login a computer and load yahoo messenger, someone is offline. But when I use the same computer, on a different IP address they are visible. In fact I've tried 5 different IP's, and they are visible only on 2 of the 5? Same computer, same everything, just different wireless networks.
So I'm wondering if they have blocked me from viewing them being online, or if it's some glitch?
Does yahoo messenger block you based on IP address or by User ID?
Can't realy offer much of an explination as to why you can see users on some pc's, but not others. My suggestion would be to upgrade to the latest verson of messenger on all systems and try again, there may be an issue with unsuported features in different version of Yahoo! messenger.