Exports only left channel

When I replay the video within PrE 10, the sound is stereo. However, when I export it (tried several format, ie WMF HD ) it will only play sound in one of the channels.
Doees anybody know, what could be the problem here?
Best regards,
Peter

I've just been experimenting with this for a couple of hours. It seems to be something in the settings for the project. I've tried to import exactly the same media (footage) to a new .prel file, I made from scratch and here sound works perfect. I've also tried to delete all the clips in the timeline for the problematic .prel file, imported new media and placed them in the timeline. This again gives only sound through the left channel after exporting.
The thing is that I've made a bunch of .prel files for a project where we need to make a lot of short videos. They are all based on the same template file (I made one .prel file that contained all the footage I needed, so I didn't have to go through the import process for each video, I made). Therefore starting all over again will really be a pain. I guess that it is a setting or something which I've made wrong in the "template" file and which has thus been replicated to all the other files. The strange thing is that the balance is perfect when reviewing the video inside PrE, only after exporting it, no sounds comes in the right channel.
I simply can't understand what I do differently in the new files and what I did in the old template (and thus in all the other files I've made). They have the same project setting, as far as I can see.
Bill, I haven't been able to find out if it has keyframes. It sounds quite possible that this is what I've done without knowing it, but on the other hand, it's strange that it changes this many times during a couple of minutes. And after investigating I found that not all the videos have this behaviour, but all of them gives only the sound through the left channel after exporting. So probably the two problems are not interrelated.
I really appreciate your help. Thanks a lot.

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