The fonts folder was the issue for me, too. I just updated my custom fonts in the folder and the game launches and my fonts are back!
So this started happening to me yesterday, I couldn’t login. I would get the disconnect message. I came to the forums to see if it was just an issue I was having or more people were. Did what was suggested and I moved everything in the fonts folder and I was able to login all day. Now today, I try to login for the first time and I can’t again. I delete the stuff in fonts folder outright and I can get in. ? A few of my addons, I adjusted the fonts to something easier for me to read, but that’s it.
Reporting back in to let y’all know that as of today (11/3/24) I was able to get my custom fonts working again. I was actually experience a battle.net issue where my game was glitching out while trying to update. I did a scan/repair through battle.net and then put my custom fonts back. The game launched and my fonts are now appearing as expected. Hopefully it works for y’all, too.
Exciting I need to try my custom fonts again.