That’s odd. I know this might feel redundant, but have you tried doing a clean reinstall of Zwift on your computer? There’s a useful guide for that here.
Also, I was wondering where you got the error that you included in your first post. As far as I know, NETCLIENT & curl errors are found solely in launcher logs, so if the issue is only with the Zwift app itself I’m unsure why you’d be getting an error there. Unless perhaps what you mean is that you’re getting an error and are unable to launch the game entirely?
I followed the guide, reinstalled, installed, updated. Then started the Launcher, logged in, then launched the game. The game launches and shows another login screen. Same error still occurs in Documents > Zwift > Log > Log.txt , so from ZwiftApp login.
Can you check again, because it seems NETCLIENT & curl errors do occur in ZwiftApp. Thanks :)!