Recently I was playing my RGB-modded SNES Jr. and I noticed some fuzzy bars moving down the screen. They appear only on blue objects. It's not incredibly noticeable, but it's definitely there. I've determined that it's not the cable I'm using, because I have the same problem with a different cable. I experienced this before with my Super Famicom, only it was much worse than this and seemed to be affected by audio. This does not seem to be affected by the audio, but I could be wrong about that.
Moreover, I've been looking at other consoles connected over RGB and I noticed it there too. On the other consoles it's barely noticeable - I probably wouldn't see it if I wasn't looking for it. But it's definitely there. Also, I can rule out a problem with my monitor because the issue does not occur with my PS2 connected over component.
So this leads me to one of two conclusions: either A) This is a common problem for several consoles connected over RGB, and the problem is slightly worse for some systems (such as the SNES Jr.) or B) The adapter I built to connect SCART cables to my Sony PVM is faulty in some way. I'm inclined to think A is the case because my adapter is very well built, and I've examined it closely many times and have never found anything wrong with it. I'm going to take a closer look at it in the future, but I rather doubt that there's anything wrong with it.
What are your thoughts?