After booting my Ubuntu Hardy machine (32 bits) I can watch and listen to television with VLC, Mplayer, Xine or even Totem (/dev/video0) thanks to my Haupauge PVR-150 and my cable provider (Netherlands). No problem there.

But if I first start listening to Rhythmbox and afterwards start VLC (or some of the others) to watch television I can't get any sound from my television broadcasts!

This is not happening when I first use Amarok. So I don't get it. It looks related to pulse audio, but it isn't. VLC sound works after closing Rhytmbox for playing divx or whatever, but NOT with the PVR device.