When I released Beta 2 this Saturday, I said it would be the last beta unless a severe bug was found. Well, a severe bug was found. Under certain circumstances Jython Beta 2 would not start on Windows. Otmar Humbel has fixed it, and we've released Beta 3 with the fix here: http://downloads.sourceforge.net/jython/jython_installer-2.5b3.jar See http://www.jython.org/Project/installation.html for installation instructions. This is a beta release so be careful. -Frank