Can you please try the following, and let me know if any of them worked:
* run vs in admin mode.
* disable other vs addins, including typemock productivity and test lint.
* run the tests dll from command line: <path_to_typemock>\tmockrunner <path_to_devenv>\mstest /testcontainer:<path_to_tests>
C:\Program Files (x86)\Typemock\Isolator\7.0\tmockrunner "C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE" /testcontainer:"C:\Program Files (x86)\Typemock\Isolator\7.0\Examples\SharePoint\bin\debug\Typemock.Examples.Sharepoint.dll"
Also, please start vs with logging enabled "devenv.exe /log" and send us the activitylog.xml (saved here: C:\Users\<username>\AppData\<roaming or local>\Microsoft\VisualStudio\10.0) to email@example.com