I was able to reproduce the problem: The scipy package installed via pip on Windows seems to require a version of the numpy that is newer than the one shipping with Ovito. Updating numpy via "pip install --upgrade" fails, unfortunately, because *ovitos* automatically loads numpy at startup, making it impossible for pip to overwrite the .pyd extension file (basically a DLL, which becomes write-protected once it is loaded into memory).

So far, I couldn't figure out a workaround for this problem. In this situation, the only way out will be to ship a newer version of numpy with Ovito. I am working a new build of Ovito 3.0.0-dev and let you know when it is available.