Telerik’s JustCode natively supports several test runners, including MSpec. This is great - the JustCode product team has taken on the responsibility to make sure the test runner works with the test frameworks, letting the framework developers focus on building even more awesome frameworks!
Occasionally, this can cause an issue, though, as we just discovered here at CodeMash. The latest rev of MSpec introduced breaking changes in the JustCode test runner. While the team is hard at work updating the test runner to be compatible with the latest api, the work around is very simple. Simply change the Copy Local setting for Machine.Specifications.dll in your project to false, and the test runner will work perfectly.
If you have any additional issues, feel free to contact me through this blog!