I use the nightbot app primarily to get song titles into my stream.
Today when I opened the app it didn’t log in to twitch, nor did it offer any login options at all.
I’m using the latest version.
It works OK in chat, and I can log in using a browser
This is due to the page being cached. You could try force quitting the app and relaunching, or reinstalling it to see if that would help. Otherwise the only way may be to remove the data from your %appdata% folder.
I tried several things, including rebooting the computer, and using “Force Reload” from the View menu, but the only thing that worked was deleting %appdata%\Nightbot