What happens: ProgDVB begins to start and reports that the device was not started, and opens the device window; the device is red-crossed-out.
If you plug the device in at that moment nothing happens. You either have to:
a) disable the device – and then reenable the device – and then the application always asks whether to scan again for channels and you have to say no not to risk loosing channels
or
b) leave the configuration untouched – close the device window – wait until the application has opened – directly quit the application – and restart the application again.
Both quite time-consuming ...

Better behaviour would be to offer the possibility to plug the device at that moment and let the user click "check again" – without the need of quitting/restarting the application or disabling/reenabling the device.