I have a clip that uses only the left channel of audio, is there anyway to duplicate it to the right channel? The theater that is showing the documentary has a not so advanced audio system, and with that clip there is no audio.

Right-click and select "Channels - Left only".
This way it's mono and you won't have any compatibility problems.

Thanks for the reply, actually I figured it out. You right click on the audio->select Channel and choose Combine.

Travis, you're better off with "Left Only". With "Combine", if there's any noise at all on the right track, it will also be included.