Zoho Assist cannot connect from one uer

In Zoho Assist, I can connect to an unattended access machine just fine, but another user tries to connect, gets to the Windows login screen, but cannot type. CRT-ALT-DEL tool also does not work. Once she is in, my connection also does not work. A reboot allows me in again, but as soon as she tries to connect, same problem. What should I do to diagnose problem?

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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,