Hi, thanks for helping me out. First the good news. Things are working. The bad news, I'm not sure why. I went back to my "mixed" folder and deleted my first attempts. Then I exported again - making sure it was selected as CD quality in the dialog box (something I'm pretty sure I'd done before) and checked the box to add it to the CD burn list. The "new" thing I did was add each new song by opening it in MC 6, exporting and adding to the CD list. Before I used the Add Track button from the burner and grabbed a song from the Mixed folder after previously exporting it there. The video says I can do it this way, but who knows.
BTW, I'm using a new HP Pavillion with Win 7, the stock sound card (Realtek Hi Def Audio) routed through the Duo Capture 2. I've had no trouble in recording or playback in MC 6 as I built up the tracks. Again, thanks for your help. I'll be keeping my fingers crossed that my "fix" stays fixed. (BTW I had a similar on again, off again problem getting my midi keyboard to talk to MC 6. It worked, then didn't, then started working again. This program is driving me crazy!) Dave