zoho assist desktop says offline

i just installed zoho assist on 3 windows 7 desktops in my office. it works fine on 2. but the third one it when viewed remotely via unattended access appears as offline. i know its not offline bc I can see it across the room. also if i am at it I can access the other pcs with zoho assist. ie they are not offline to it but it is offline to them. very odd. please help

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Release Notes: Version 1.91, February 2015
Unattended Access (Beta) is live! Unattended Access, a feature requested by a lot of our customers is live now. Currently, it's in beta. You can add up to 100 computers per Technician subscription. They can also be accessed by your organization members. My Computers list in Zoho Assist home page will always display the online status of your unattended computers. You can rename the computers whenever you wish. Currently, Unattended Access can be configured only for Windows computers. Nevertheless,