[PatK]

Ok your direct link make it abundantly clear what you're up against. (suggest you pull the first post images and replace it with the link) Prior I would have said to check your cable connections. It does look like something is influencing your colour spectrum. Do you have some sort of after effect or video correction setting in your graphic card? I limit all colour space corrections to the actual final panel display and don't seem to have this problem. This definitely looks like a Video levels and color space (wiki) issue off-hand, but we need to establish what a debug log would show, so if you could be so kind to supply a proper debug log to a public paste-bin and that URL linked back to this thread. log (wiki) might be good to have the video/ffmpeg component logs on.