reinteract/lib/reinteract/global_settings.py:
# In a shocking example of cross-platform convergence, ~/Documents
# is the documents directory on OS X, Windows, and Linux
self.notebooks_dir = os.path.expanduser("~/Documents/Reinteract")
This is completely wrong -- on Windows, this path is obtained by calling SHGetFolderPath(NULL, CSIDL_PERSONAL, NULL, 0, buffer), on Linux it's stored in ~/.config/user-dirs.dirs and apparently doesn't have an API to access it, and I imagine there's something similar on OS X.
The end result is that you're creating folders and files in the wrong place and annoying your users.