WebStorm 2016.2 EAP (WS-162.917) on Windows 7.
"C:\Program Files\Git\bin\bash.exe" --login -i
in Tools -> Terminal under "Shell path:". Running this command from the windows "Run command" dialog opens the shell just fine.
What happens when I open a terminal in WebStorm is... nothing. The terminal opens briefly and quickly shuts down again. There is no output and there is nothing in idea.log