Stereo audio works only in FCE

I know this has been covered before but I would like some help to get from where I am now, out of the hole I seem to have dug.
Briefly, VHS video with HiFI stereo audio was converted with a Sony DCR TRV355 camera to DVPAL 720x576. Audio 16Bit 48Khz. Firewire cable plugged into the MAC running FCE4 and captured using 'capture now'. So far so good. I drag the clip to the timeline and the two audio tracks and the video track appear. The three names are all underlined. The two audio tracks are linked (the two arrows point to each other like an hour glass where the two tracks touch). The audio plays in stereo. I do nothing to this file, and quit FCE. Now, if I play that untouched captured file on a MAC or PC, in Quicktime, Windows Media Player, FLV whatever, the audio is mono, not stereo. Possibly only one leg of the stereo pair, or possibly left and right summed to mono, it's not easy to tell.
So I have two questions really:
One (not relevant to this problem as I cannot recapture the clip), what do I need to do differently next time to avoid this incompatibiliy?
Two, how do I get from here to being able to play the .mov file in any player in stereo, without degrading the picture? Thanks in advance.

... VHS video with HiFI stereo audio was converted with a Sony DCR TRV355 camera to DVPAL 720x576. Audio 16Bit 48Khz. Firewire cable plugged into the MAC running FCE4 and captured using 'capture now'.
This should have worked fine. A few questions -
Did you use the TRV355 as a converter between your VHS deck and your Mac, or did you record the VHS video to a tape in your TRV355 ... and later use FCE to capture from the TRV355 tape?
What Easy Setup did you use in FCE when you captured this video?
Exactly what versions of FCE, OS X and QuickTime are on the Mac you used to capture the video? Do you have QuickTime7 installed on this Mac?
Did you experience the "mono problem" playing the captured clip on the same Mac you used to capture the video, or did the problem appear on a different Mac?
When you experienced the "mono problem" were you playing the captured clip in QuickTime X or QuickTime 7?
For what it's worth, I have observed that if I play a video clip in QuickTime X that was captured on a Mac with FCE/QuickTime 7, for some inexplicable reason QT X does not fully recognize all the tracks in the clip. Mostly it thinks the clips are audio only, no video; but if I play the clip in QT7 it plays fine.

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