F# library gets corrupted after adding reference to Isolator

I tried to use latest (6.04) version of Typemock Isolator with F#, and didn't work at all. Here are the steps:

1. Create an F# library using VS 2010.
2. Add a reference to Typemock.Isolator.ArrangeActAssert DLL
3. Build a library.
4. Try to load it in NUnit test runner or select "Run test" using Testdriven.NET.
5. The following error is displayed:

Test '' failed: Operation could destabilize the runtime.
System.Security.VerificationException: Operation could destabilize the runtime.
at Microsoft.FSharp.Core.CompilationMappingAttribute..ctor(SourceConstructFlags sourceConstructFlags)
at System.Reflection.CustomAttribute._CreateCaObject(RuntimeModule pModule, IRuntimeMethodInfo pCtor, Byte** ppBlob, Byte* pEndBlob, Int32* pcNamedArgs)
at System.Reflection.CustomAttribute.CreateCaObject(RuntimeModule module, IRuntimeMethodInfo ctor, IntPtr& blob, IntPtr blobEnd, Int32& namedArgs)
at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, Int32 pcaCount, RuntimeType attributeFilterType, Boolean mustBeInheritable, IList derivedAttributes, Boolean isDecoratedTargetSecurityTransparent)
at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeType type, RuntimeType caType, Boolean inherit)
at System.RuntimeType.GetCustomAttributes(Boolean inherit)
at NUnit.Core.Reflect.GetAttributes(ICustomAttributeProvider member, Boolean inherit)
at NUnit.Core.Reflect.HasAttribute(ICustomAttributeProvider member, String attrName, Boolean inherit)
at NUnit.Core.Builders.NUnitTestFixtureBuilder.CanBuildFrom(Type type)
at NUnit.Core.Extensibility.SuiteBuilderCollection.CanBuildFrom(Type type)
at NUnit.Core.TestFixtureBuilder.CanBuildFrom(Type type)
at NUnit.Core.Builders.TestAssemblyBuilder.GetFixtures(Assembly assembly, String ns)
at NUnit.Core.Builders.TestAssemblyBuilder.Build(String assemblyName, Boolean autoSuites)
at NUnit.Core.Builders.TestAssemblyBuilder.Build(String assemblyName, String testName, Boolean autoSuites)
at NUnit.Core.TestSuiteBuilder.BuildSingleAssembly(TestPackage package)
at NUnit.Core.TestSuiteBuilder.Build(TestPackage package)
at NUnit.AddInRunner.NUnitTestRunner.run(ITestListener testListener, Assembly assembly, ITestFilter filter)
at NUnit.AddInRunner.NUnitTestRunner.AssemblyRun.Run(NUnitTestRunner testRunner, ITestListener testListener, Assembly assembly)
at NUnit.AddInRunner.NUnitTestRunner.run(ITestListener testListener, Assembly assembly, IRun run)
at NUnit.AddInRunner.NUnitTestRunner.RunAssembly(ITestListener testListener, Assembly assembly)
at TestDriven.TestRunner.AdaptorTestRunner.Run(ITestListener testListener, ITraceListener traceListener, String assemblyPath, String testPath)
at TestDriven.TestRunner.ThreadTestRunner.Runner.Run()

The error is persistent and reproduceable. And apparently a serious one, since it basically makes Typemock Isolator unusable with tests written in F# - something I was trying to do.