@andrew84 I've been noticing this little blue line on Youbube videos and at first, thought Uh! oh! My Sony 4K TV LCD is breaking down. LOL
I analyzed the issue as related to Lucid mode.

When I saw your post about 110%, I checked my zoom and sure enough, it was at 110%. I put it back to 100% and the line goes away.

Thanks for that tip. I don't have to worry about the TV anymore. LOL