Flickering in top of screen after editing

After editing an project in FCP X there's a small flickering in top of the screen (approx 2 mm.). The recordings are perfect, also after import. So the problem - which I haven't met before - arises after editing in timeline.
Bw,
Jonas

Thank you, Tom.
It begins approx 30 secs into http://youtu.be/tt-l3aJNDiY
Recorded in the same camera I always use (without problems): Canon XA20.
Do you know how I can analyze and fix problems with interlacing?

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****Click the White thumb to say thanks****
****Please mark Accept As Solution if it solves your problem****
****I don't work for HP****
Microsoft MVP - Windows Experience

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Flickering in top of screen after editing

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