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The sources for all OpenG libraries are on sourceforge. There is a project for the "OpenG Toolkit" and a separate project for "LabPython", since LabPython predates the OpenG Toolkit by a few months. The first search result in Google points to the LabPython home page hosted on sourceforge and has links to the the sourceforge project page where you can go to the code section and see that it contains both the LabVIEW and C code. It's still in CVS but there is an option to download the entire repository as GNU tarball, so no need to install a CVS client if you don't want to. As to the reason why it may crash, when you add ROOT to your python project, there are many possibilities. LabPython was developed with Python 2.3. It seems to work fairly well for most people with Python versions < 3.0, but there seem to be problems with certain Python libraries that contain binary components (C(++) DLLs compiled as Python modules). The reason is probably some version conflicts in runtime libraries between LabVIEW, the LabPython DLL and those binary Python modules. Hacking your own ROOT script interface based on LabPython might be a possibility but unless you are really deep into C programming I wouldn't recommend it.