I was using web tv and had occasion to set the sound volume (in the program) to minimum. I then switched the program off.
Later I discovered that I had no sound on any progs. OE, radio etc.
This morning I had a 'flashback' and thought 'wonder if Hauppauge is the culprit?'
To cut a long story.... restoring volume in web-tv brought back sound on everything.
Just posted for info.