@cbmorehouse Can you confirm when the last reboot was of the affected machines?
I'm not sure when they have been restarted, but why should that matter? When you close out of a session it shouldn't still show "In Session" within the list of devices.
@cbmorehouse It's possible there mat be some updates available for the G2A desktop installation. Please let us know the affected OS and Remote Support version installed upon the problem PCs.
@cbmorehouse There was a brief UA disruption last week that may have affected some of your machines. Is this problem still occurring after rebooting the PCs?