Probably because the 2.8.5 client is firewalled and maybe you too on port 6346. Newer Limewires advertise the chat buttons only when they are unfirewalled, but this wasn't the case in 2.8.5.

To check if you are firewalled: options-bug reports-see an exemple-Received incoming this session:
-if true you are not firewalled
-if false you are firewalled somehow.

Ciao

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