I encountered the same results. I guess this may be caused by the version of numpy or other depended python packages. But I do not have time to figure out which package play the role. I changed the version of python, matplotlib on my mac. Nothing helps. It seems that the newer version of python modules are using different logics from the older ones, so I think one possible way to takcle this problem may be installing all the modules used by the source code developers of AUTO 07p