Thanks for bringing this to our attention and sorry to hear you’re having trouble with YouTube, it could be related to an extension interfering with your profile, please try removing your extensions to see if it works properly. To Remove an Extension:
On your computer, open Brave.
At the top right, click Menu icon --> More tools --> Extensions.
On to the extension you want to remove, click Remove.
Confirm by clicking Remove.
Or:
On your computer, open Brave.
On your extensions toolbar, right-click the extension you would like to remove.
Select Remove from Brave… from the context menu.
Additionally, try to disable block script and shields . At last, please open a new page using private mode or guest mode. Let me know if that works and have a nice day!