Brief update: it seems WinTV7 is unable to "communicate" properly with the Ministick. Every time I start the software or finish scanning for channels and go to "devices" in the settings menu, it tells me that my Ministick (and Win TV-HVR-1200) is available. But when I click on Tuner setup it tells me that "the device setup wizard has detected a new device that needs to be installed. Device: Win TV Ministick (000DFE721EC5). Please select type of channels...."
Needless to say, I have set up the device dozens of times, and the tuner finds 10 FTA channels (plus as many encrypted channels) every time.
Still waiting for someone to shed some light. Nick