Unattended Client tray icon not shwoing on some client PCs

Hi. Ive having an occassional problem where unattended client PCs don't always show the tray icon. This is often not a problem, however does cause difficulties where the client PC has access disabled. This can usually be fixed by reinstalling the client s/w but recently had a situation where it did not.

What causes this problem and what can i do to reliably fix please...?

Thanks.

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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,