Created attachment 156988 [details]
On Windows 8.1, invoke File->New Project. Select Category: Python and Projects: Python Project - Setuptools.
Accept the defaults and the project is created.
Expected results: The Project is expanded in the Project Pane, and __init__.py and newpythonprojectnn.py are visible in the newpythonprojectnn package.
Actual results: The Project is NOT expanded in the Project Pane, and <Top Level> package CANNOT be opened. Note that when you restart the IDE, the project appears correctly, but you still cannot create new correctly.
This only happens under Windows AFAICT (Works fine in ubuntu 14.04).
Product Version = NetBeans IDE 8.1 (Build 201510222201) (#bb5d68d8a020)
Operating System = Windows 8.1 version 6.3 running on x86
Java; VM; Vendor = 1.8.0_66; Java HotSpot(TM) Client VM 25.66-b17; System Locale; Encoding = en_US (nb); Cp1252
This should be solved by the next release we planned for August. In the meantime, you can try the dev version: https://bitbucket.org/Jenselme/nb-contrib/downloads/2017-06-04-nbpython-nbms.zip
Thanks for your evaluation Julien. Reporter, if you think your issue is still valid and needs to be addressed, don't hesitate to reopen it with additional information. Closing for now.