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In the picture it looks like a luminance smear to me, not color.
Hard to track down this kind of long smear, as it could come from several things.
1) in the video source - have you tried different sources?
2) in the modulator (apparently not, you tried several)
3) in the receiver IF (apparently not, you have tried 2 sets)
4) in the receiver video section (apparently not, you have tried 2 sets)
It's also possible that in the combinations you have tried, you are getting similar but not identical effects from different places in the system as you change things. But if you are always using the same video source, that is now the obvious suspect.
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