Gray lines (masks)

I'm getting frustrated with this issue.  My client shows me gray lines that I thought corresponded with mask lines in my frame.  I see the lines on his PC, but I can't see anything on my monitors, not in FCP, Quicktime, external monitors, and I've gone through the full range of adjusting contrasts.  I'll describe the signal path, in case it is relevant.  Before I do that, my observation of this shows the lines at the edge of the frame directly above the subject.  The brighter the subject (one is a doctor in a white smock) the brighter the gray.  Can cheap PC laptop displays (or any sort of display) generate a reflective horizontal gray line when the video levels aproach 100%?
This stuff was shot on a Cannon 7D, rotated 90º so the subjects are shot on a frame 1080x1920 on a green background.  There is actually a lot of overshoot.  They have been keyed over black through AE keylight.  In FCP, we rotated it back 90º and have framed it, frequently over black, sometimes with images beside it.  That means the top of the shooting (and masked layer) frame is always in the frame as the screen right border.  We don't see any gray line there, vertical.  After the entire show was completed, these scenes repeat and keep showing the problem.  I've been through numerous versions of masking or not masking the black area above the subject's head but his PC keeps showing a gray line above the image (and not in the black area to the sides).  After FCP, I first exported it as ProRes 422.  To ship it to him I converted the 1920x1080i to a 640x360 h.264 quicktime.  I've got 5 monitors here, Macs and PCs.  None of them can see the problem.  He's the client and keeps seeing the problem on his cheap PC, so its a catastrophic problem.  I'll attach samples of the 4 subjects in question if this works.

Dont know what camera was used, the footage was given to me. The dimensions of the footage is 720X486. Dont know if that helps.

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