Using the current version of ReSharper (9.1) and NUnit (2.6.4), whenever I right click a feature or step in a feature file and click ReSharper's "Run Unit Tests" it throws an error and says no unit tests found.
I've found if I use the built in MSTest or if use SpecRunner, it works fine, but I lose the features of NUnit.
I can run NUnit tests fine normally, and confirmed that the proper version of NUnit is listed in my SpecFlow config, and ReSharper settings, and everything appears to line up.