On an occasion, I found NCrunch was getting stuck at this step when 'NCrunch engine is initialising':
Clean/rebuilds and restarting Visual Studio did not resolve this issue.
To resolve the issue, I closed Visual Studio and navigated to the Visual Studio project folder in the file directory and located the hidden .vs folder and the '_NCrunch _[projectName]' folder and deleted those.
Then I cleaned and rebuilt the solution and NCrunch started functioning again.