scrolling lines in fcp7
I am working on a 35-minute film and having difficulty with one piece of footage that doesn't seem to be any different, settings-wise, to any of the others. As a QT movie it is fine, when I import int into FCP7 it has a scrolling line that moves vertically upward every - guessing - 20 frames or so. I've tried different codecs and can't seem to solve the issue. Can anyone help?
Codec: DVC-PAL, dimensions 720 x 576, 25fps, data rate 3.4MB/sec
Mac Pro