Stereo audio in left channel only.

Hi,
I have a strange problem with one of my projects.
I have created a large number of "talking head" videos/projects. I export them to FLV using one of PREs default settings. For just one of these projects I get audio in the left channel only. All other clips are OK.
When I play the clips on the timeline the audio is perfect in both channels. So somewhere in the rendering/output process I loose the right channel.
What am I missing here?
Thanks in advance.

Hi and thanks for all input.
Yes I use a mono mic, but the camera puts the sound on both channels.
When I play the timeline I hear the voice in both channels.
The timeline audio track shows waveforms on both channels.
Here is a pic of the timeline:
The project is corrupt somehow. I just tried creating a new project with the same video files and made a short flv out of it and it comes out OK.
I will try to redo this one which leads me to another question which I will post in another thread if not already answered.
Thanks for your input.

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