I have just downloaded and installed gbpvr on my laptop. My laptop display is set for 1024x768 while my external monitor (through VGA) is 1600 x 1200. I am using the WinTV PVR USB2.0.
When I run gbpvr on my laptop display, I get live preview working in both the video and audio aspect. However, when I try to get it running on my external monitor (which is really where I want it) I can still hear the audio, but the screen is black.
My WinTV works without issue on either display.