On v3.6.0.1, the Splashtop computer list isn't populating. Workaround is to uncheck the View Setting, "Show Groups".

iOS:

Open Splashtop Business > View (Monitor/arrows icon on top right) > Uncheck 'Show Group'

Mac:

Open Splashtop Business > View > Uncheck 'Show Group'

Windows:

Open Splashtop Business > View > Uncheck 'Show Group'