Video Dropout in Compressor 4 Transcodes

Hi,
I'm exporting a ProRes master from FCP7 then loading the file into Compressor 4 for transcoding to H264 1080 for YouTube and Vimeo.
The resulting file has video dropout thoughout.
Is this a known problem and if so does anyone have any work-rounds and/or fixes for this problem?
Thanks.
RE

Hi Russ,
I have had this happen a few times now.
The workflow is: ProRes 422 edit > export ProRes 422 from FCP 7 > transcode exported file in Compressor 4 to H264 1080 (YouTube and Vimeo preset).
It's the transcoded produced by Compressor file that has the dropout in it, not the uploaded file.

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