PyCharm Does Not Recognize Anaconda Python 3

I just installed the latest Anaconda 3 (5.1.0) for all users on a Windows machine.  The Anaconda installation is in c:\ProgramData\Anaconda3 and I have verified that the installation works.  Anaconda registered itself as the Python 3.6 on my PC.  Then I installed the March 6th, 2018 build of PyCharm.  Unfortunately, PyCharm cannot find either Python in Anaconda3 or my older Anaconda2 installation.  When I go to File-Settings-Project Interpreter there are no interpreter options to choose from.

I the past this has always been automatic - PyCharm has automatically recognized all of the Python and Anaconda installations on my machine.  But there seems to be a problem with the latest Anaconda and Pycharm.

For now I am stuck with a less capable editor - but I would really like to get back to using PyCharm.  Any suggestions to make it work?

Thanks.