No sound in VSE (2.5b file in blender 2.62)

I’ve just installed 2.62 and am working in a VSE project I started in 2.5b.

When I opened the file, suddenly “audio muted” had been checked, so I unchecked it. But still I’m getting no audio scrubbing, playing or rendering. (I checked audio scrubbing, AV sync and frame dropping.)

After changing the audio settings to SDL, 48KHz, my audio started working in a 2nd scene in the same file, but still no sound in my main project.

Any help would be greatly appreciated!

Use 2.62 to save your project to a new file and re-open it?

Are you on windoze or linux?
What is the source audio container/codec? How about the video container?