This just started today with my Songbird 2 on Windows 7 64 bit. Everything was up to date expect mlyrics extension. At home I have no internet connection so I'm offline most of the time. I'm at a cafe now connected to the internet and Sonbird will crash a second after I try playing a song.
The addons I have are all the recommended ones: 7digital, Concerts, Gracenote, Last.fm, Mashtape, Mlyrics, Songbird.me, the playback ones and the device addons.
I just disabled most of them, expect the playback and device capability addons and I can play now. So it most be an addon that needs to connect. I will have to go through them and see which one is crashing Songbird. :/
Help get this topic noticed by sharing it on Twitter, Facebook, or email.