Last night, I was catching up on some things that I had recorded over the weekend from VCR. It was getting late and the room was dark, and I noticed that the picture was going slightly dark, then slightly light. This looked very similar to mild macrovision symptoms. So, I stopped the tape, and watched some TV from the VCRs tuner. Again, I could notice the picture fading from dark to light. I then switched to the same channel, using the TVs tuner and it was fine. I looked at Sky (in Composite on AV2) and that was fine too. But the VCR (on AV4) was not. I swapped the cables, so that the VCR was now on AV2 and the picture still faded. This morning I tried again, but could not see it.. Saying that, the room was much lighter and in day light, its much harder to perceive subtle changes in brightness. There must be something about the composite signal from my VCR to the TV.. But what? Does anyone have any ideas?