I have been exporting from FCP and Quicktime player and getting grey blocks across the video or photo.
I have older versions of things: FCP7, quicktime player 7.6.9 and my OS is 10.5.8 on a macbook pro laptop.
My video however is Calibrated DVCProHD 720p60 Integer Little Endian (it was exported from FCP) and I put it back into FCP to do export or do export from QT player. Either way, I get the grey blocks/or lines.
I'm not able to update to proappsqtcodecs because of my OS.