If EpocCam is not working as expected, please try these general troubleshooting steps first.
Windows
1) Open the Windows Task Manager Services tab to make sure both Bonjour-service and EpocCamService are running.
2) If not, start them by right clicking and choose "Start Service".
3) If you cannot see Bonjour-service or EpocCamService, please (re)install the required Windows drivers.
macOS
1) Open Activity Monitor
2) Highlight "EpocCamDeamon", and choose the "X" icon at the top left corner of the window to Force Quit it.
3) Try to connect to EpocCam again.