RackAfx / Visual Studio 2015 Integration problem:

I have Visual Studio 2015 Professional installed under Windows 10 and have for quite some time, everything working well.

I installed RackAfx v6.9.1.0 (yesterday) and it is working in the sense that it generates a buildable project. If I manually launch visual studio, I can successfully build the project.

However, if I select the Open Compiler toolbutton from the RackAfx GUI, or if I right click on the background of the first control in the GUI (In my case Knob Grp 0 since my view is set to modern), I get the following error messages:

from toolbutton: Error in CreateProcess() for compiler path:

c:\Program Files(x86)\Microsoft Visual Studio 14.0\Common7\IDE\devenev.exe

from Knob Grp 0 right background click:

compiler is not alive/available yet (while visual studio is open and running)

I have verified this is a valid path to my Visual Studio installation and devenv.exe is present, I am logged in as Administrator, and

in View,Preferences on the RackAfx Main menu I have set the Visual Studio C++ compiler droplist choice to 2015 Professional/Enterprise/Community

Furthermore, if I double click on the .vcxproj file in Windows File Explorer, Visual Studio autoloads the project just fine.

Any help / suggestions would be appreciated. I did look through the Faqs but did not see this addressed there and I did not see this specific issue addressed in this forum, but (Famous Last Words) I may have overlooked something.

TIA