Derfurbit

When first tried this I got a good recording. The second attempt I wasn't able to record. I hit record I get a "wait" then "ready!" prompt but, time does not advance and no activity shows in the bar. When I stop the session it shows a file saved about 4kb but no sound plays. My USB headset shows in System Preferences and worked the first time. I am running Mac OSX, 10.4