Part of the post build on my project is the execution of a program I wrote for testing the main application. Unfortunately, the post build process in visual studio locks up
I also found that the start trick didn't work and downloading a separate tool to complete such a simple task seemed excessive. After some additional searching I found this SO post which gave an answer that worked for my needs.
Just replace with your command. Remember to give the full path to the executable and encapsulate it in "quotes" if there's spaces in your path.
powershell start-process