I have a Windows 8.1 laptop, HDhomerun prime tuners and the latest JRiver software. I can tune a channel, but when I attempt to change to another channel, the picture freezes and I get a machine gun sound. If I first push the stop button, the tuner releases and I can change to another channel. I don't have hardware acceleration on. Also, the "manage channels" page has the bottom of the page below the screen.