I can't seem to reproduce the invalid connect.sid
I did some error catching and better logging for the internet issue; also it seemed like you weren't supposed to see the "login" button when there is no internet as there is a case for this button to show "No Internet"

1. You have to set an invalid connect.sid manually to the settings files and then open the application and try logging in, that's basically how it happened for me. Could also have been related to the outdated Gold check or smth.
2. Indeed, but if the login button is already there and I loose my connection I can still click it.

I'll pitch in here with some bug reporting, I had a prior version of the utils and I just reinstalled to the latest version pre-release.

I believe this is a 2FA issue, correct me if I'm wrong

When I started the app up it already had an sid (which it said was invalid). I tried using the login in feature with my details and I recieved an incorrect username/password.

I logged in online and used the sid following the prior method and the rest of the app seems to work fine.

The connect.sid issue being invalid sometimes happened to me in the past, this is not a 2FA issue, though 2FA of course doesn't work with the current login dialog (also now with APIv2 we know the endpoints for 2FA, that's something we could add).