Last.fm scrobbler works once then doesn't loggin at the next startup.

I started using Songbird 1rc3 yesterday and managed to log in to last.fm and enable scrobbling.

This morning, I wanted to use songbird again, and when I checked if it was scrobbling, the last.fm icon is gray and there is no love/ban buttons.
In the tools menu, I see (all enabled) "Log out of last.fm", "log in to last.fm" as well as an unchecked "enable scrobbling".

- If I check "enable", the logo stays grey and it doesn't seem to scrobble
- if I click log in, nothing happens,
- if I click log out, nothing happens