Hi, today I installed the new version of mono 2.10.4 (http://www.mono-project.com/Release_Notes_Mono_2.10.4), because packaging problems on MacOS X should be fixed. But in this version there is "IronPython 3.0 (3.0.0.0) on .NET 4.0.30319.1" Is this the official new stable version of IronPython? - Sven