I just added xUnit to our test project (for the Asserts, we\'re still using MSTest as the framework) and immediately the test runs refused to execute any of the tests. This
It may seem really obvious now, but when I was clicking unblock the file was set as read-only.
Only after un-checking that attribute, applying, then selecting unblock did I actually get this working.
Give that a go.
:)
PS: I also deleted all the old dll's in my bin folder, just to make sure Visual Studio wasn't picking up the old one.