The standard banshee configuration hangs when run without network connectivity.
I have narrowed this down to the Ubuntu One plugin - if you disable it, banshee works fine.
The failure mode is that the UI becomes unresponsive, at least 2 threads are running infinite loops
(cpu usage is 170% on a 2-core machine, i.e. 85% cpu usage each), and you have to quit through the 'force quit' dialog.
I have attached the output from stderr, which includes a Glib assertion failure and a C# stack trace.
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: banshee-extension-ubuntuonemusicstore 2.2.0-1ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic i686
ApportVersion: 1.23-0ubuntu3
Architecture: i386
Date: Tue Oct 18 12:21:22 2011
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
ProcEnviron:
LANGUAGE=en_US:en
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: banshee
UpgradeStatus: No upgrade log present (probably fresh install)
I haven't said it explicitly, but the problem goes away when you disable the Ubuntu One plugin.
This is a good workaround for people who don't use Ubuntu One and want to play music without network connectivity.