Online, but appears offline

I am using Psi, connected through my host's Jabber server.  When I chat 
with someone on Gmail Talk, which like Jabber is XMPP, she sees my 
status as being offline and unable to take messages.  But my client sees 
me as "online," or even "available to chat."  Is this an XMPP 
compatibility issue, or a Psi issue, or a gmail Talk issue?

JN

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