Hi Remco,
SpecFlow uses a .feature file and a .feature.cs file, which is automatically generated by the VS plugin when the .feature file is saved. When you edit the .feature file, NCrunch will detect this in-memory edit and immediately run the test. This will be before you have saved the .feature file, and therefore before the .feature.cs file has been regenerated. Therefore NCrunch will be running the "old" version of the test from the original .feature.cs file.
Would it be possible to /not/ run SpecFlow tests until the backing .feature.cs file has been updated?
Thanks,
Dan