When I create new NUnit unit tests in my test project, the ReSharper Unit Test Runner detects them but they remain grey and are not run.
This behaviour occurs whether I try to run the tests individually or all together.
If I close and reopen the solution, the new tests are detected and run correctly.
The behaviour only occurs if I build the solution using Visual Studio before I run the tests. If I let ReSharper trigger the build, the tests are detected correctly.
I am using:
- Visual Studio 2010
- ReSharper
- NUnit 2.5.7
Try cleaning the solution and delete RS related files and folders from your project folder. It has worked for me. I use VS2008 though.