What I have been able to figure out is this is an issue with the google Crome engine not wanting you to use their sites without being subject to all of their advertising. I was having the same problem but if I disable all brave shields for google G-mail log on screen at the error page and then refresh it it will log right in, BUT after that when I open up a youtube video I’m automatically logged on to youtube because I’m still logged on with my G-mail account as is normal but even though I have NOT disabled brave shields for youtube it doesn’t matter they will be disabled for youtube as well and I get all of the ads. NOW if I open a youtube video when I’m not signed in with my google G-mail account all brave shields are still up and working fine and no ads. So my conclusion is this is googles doing and doesn’t have anything to do with Brave I don’t think. Likely a bug programed into the crome engine on purpose to force everyone to view their advertising. So Brave developers you might want to think about putting together a Brave version with the Mozilla Fire Fox engine and ditch google all together.