Unable to Connect to Online Computers

I have 11 computers online but I cannot connect to about half of them in Assist. When I click the "Connect" button they systems hang at "You'll be able to access the remote device shortly." I've tried to uninstall and reinstall the Assist agent, and I can get the PCs to connect with the Join Session option. Not sure where else to look for troubleshooting logs. Any help would be appreciated.

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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,