This problem seems strange to me, the problem appeared today when I opened my browser. Yesterday brave was able to block all ads on YouTube, Today it can’t, I was hoping to find out if there is a fix, or if other people had the same problem. I do not believe the problem was directly caused by the update from the old version of brave as the problem is just now appearing.
Did the issue present with default Shields settings? Yes
Where and how do the ads appear? Any Youtube video. Example: https://www.youtube.com/watch?v=-WMcb4223TI
Brave is up to date
Version 0.57.18 Chromium: 71.0.3578.80 (Official Build) (64-bit)