Authentication error... and how does this work anyway?

[agrafuese]

I followed the installation instructions to a T, trying both the virtualenv method and without virtualenv. As far as I can tell, I did everything I should, with the API setup and everything. Still, the error log tells me there's an authentication error. I'm really not sure what that means, considering I am using the very same username/password that I use to log in to the website, so obviously there shouldn't be an issue there. Is this some kind of API problem on Last.fm's side? The vagueness of the error isn't very helpful for trying to troubleshoot problems.

Also, what exactly is supposed to happen when I run the "nohup plex-scrobble &" command? There is very little feedback from the console other than the "ignoring input..." message, and a random number being displayed. It doesn't spit me back out to the command prompt either - it just hangs me up until I hit ctrl+C to force exit. Is this normal behavior? Or is this because of the auth error?

Lastly, when I log in to my account on Last.fm, and go to the Applications settings section, am I supposed to see a new custom entry for Plex-scrobbler? All I see are the standard Spotify app entries. I assumed creating the API key and secret would give me something there, no?