Can not instantiate controllers in tests

When I try using unit tests (Microsoft vs2010-embedded testing framework) with MVC3, all unit tests that instantiate a controller throw the following error:

Test method CleanTestMVC.Tests.Controllers.HomeControllerTest.About threw exception: 
System.Security.VerificationException: Operation could destabilize the runtime.

It seems to be not project-specific: I have created a new MVC3 project with an internet application template and the default auto-generated tests for it and those don't run as well. I've tried recreating the problem on a colleague's machine (identical settings) and his machine seem to create same issues.

No references or external libraries were added for those projects, but both computers do have TypeMock installed, althou开发者_开发知识库gh not referenced and disabled in the options (I've heard people blaming it for similar issues).

Could anybody please suggest something? A workaround and/or a potential cause? It is the first time I use MVC3 with unit testing and nobody around have ever worked with MVC3 and this is a "guinea-pig" project for it.

Thanks for the help!

Update: After trying it at my home PC everything works there even though I also have TypeMock (trial) installed.

Update 2: The stack trace for the problem: System.Web.Mvc.Controller..ctor() CleanTestMVC.Controllers.HomeController..ctor() CleanTestMVC.Tests.Controllers.HomeControllerTest.About()

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Ok so in the end it turned out that the company had an older version of Typemock installed, which was incompatible with MVC3. Disabling Typemock through the Typemock->Disable Typemock didn't actually "fully" disable it, it had to be unchecked in "tools/Addin Manager". After updating Typemock to the latest version the problem is solved.