Why is my audio cutting out in iMovie when I do green screen?

I am creating a newscast in iMovie using green screen. As I get farther into the movie, the audio cuts out of the scene. Why is this happening?

The audio from both background and green screen foreground clips should play simultaneously but you should be able to adjust the tracks individually.
see: http://help.apple.com/imovie/mac/10.0/#mov82da1338a and http://help.apple.com/imovie/mac/10.0/#mov8858fa85b
Geoff.

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If my understanding is right, this RDP issue only occur in the connection between Windows 8.1 and Server 2008.
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To resolve this issue caused by update 2989039, install update rollup 2984006. For more information, please refer to the following KB.
http://support2.microsoft.com/kb/2989039/en-us
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Fangzhou CHEN
Fangzhou CHEN
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