Hi @mrpaul,
Did you notice any error notification on primary machine?
Do you maybe have splashtop software installed on your primary machine?
Could you please send us the following info:
Primary Machine
– operating system (Windows 8.1/10)?
– graphics adapter (AMD/Intel/Nvidia)
– network connection type (wired/wireless/USB tethering/WiFi Direct)
Secondary Machine
– Viewer type (Android/iOS/Windows/HTML5)
– network connection type (wired/wireless/USB tethering/WiFi Direct)
For assistance, please also check the troubleshooting chapters in our user manual https://spacedesk.net/user-manual.