Bug #377672 <https://bugs.launchpad.net/ndesk-dbus/+bug/377672> I stumbled upon this while trying to suspend my laptop using Gnome-DO's Gnome-session plugin. It may also cause problems with other C# apps. There's a quick fix for this in the first post of the launchpad's bug report : --- ndesk-dbus-0.6.0.orig/src/TypeImplementer.cs 2007-10-11 20:01:11.000000000 +0000 +++ ndesk-dbus-0.6.0/src/TypeImplementer.cs 2010-01-29 18:11:32.000000000 +0000 @@ -34,7 +34,7 @@ namespace NDesk.DBus InitHack (); - TypeBuilder typeB = modB.DefineType (declType.Name + "Proxy", TypeAttributes.Class | TypeAttributes.Public, typeof (BusObject)); + TypeBuilder typeB = modB.DefineType (declType.FullName + "Proxy", TypeAttributes.Class | TypeAttributes.Public, typeof (BusObject)); Implement (typeB, declType); Might want to add this quick fix to the package in extra.