Occasionally, if I reinitialize Python and rerun a script, I get the following error: FATAL Python error: UNREF invalid object from my code I do the following: /* alot of other crap and then */ PyRun_SimpleString("From Numeric import *\n"); eventually in multiarraymodule.c array_set_string_function() Py_INCREF(Py_None) which eventually calls (according to my stack trace) where the error occurs PyArray_SetStringFunction() Py_XDECREF(PyArray_ReprFunction) Is this a Numpy problem, Python problem, or my problem? I can run the same python script several times, and then I get the error. Something isn't being cleaned up properly around Py_Initialize() Py_Finalize() pair. I am using Python 2.1b1 and Numeric 18_1 with Boost -- Cheers, Karl Bellve