I've upgraded to Isolator v7, but also no success.
I got slightly different errors in the Processing Queue:
[08:28:16.079-TestExecutionTask-100] ERROR (Internal): System.InvalidProgramException: Common Language Runtime detected an invalid program.
at System.Uri.NotAny(Flags flags)
at System.Uri.PrivateParseMinimal()
at System.Uri.InitializeUri(ParsingError err, UriKind uriKind, UriFormatException& e)
at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind)
at System.Uri..ctor(String uriString)
at NUnit.Core.AssemblyHelper.GetAssemblyPath(Assembly assembly)
at NUnit.Core.AssemblyHelper.GetDirectoryName(Assembly assembly)
at NUnit.Core.TestFixture.Run(EventListener listener, ITestFilter filter)
at NUnit.Core.TestSuite.RunAllTests(TestResult suiteResult, EventListener listener, ITestFilter filter)
at NUnit.Core.TestSuite.RunSuite(EventListener listener, ITestFilter filter)
at NUnit.Core.TestSuite.RunSuiteInContext(EventListener listener, ITestFilter filter)
at NUnit.Core.TestSuite.Run(EventListener listener, ITestFilter filter)
at NUnit.Core.TestSuite.RunAllTests(TestResult suiteResult, EventListener listener, ITestFilter filter)
at NUnit.Core.TestSuite.RunSuite(EventListener listener, ITestFilter filter)
at NUnit.Core.TestSuite.RunSuiteInContext(EventListener listener, ITestFilter filter)
at NUnit.Core.TestSuite.Run(EventListener listener, ITestFilter filter)
at NUnit.Core.TestSuite.RunAllTests(TestResult suiteResult, EventListener listener, ITestFilter filter)
at NUnit.Core.TestSuite.RunSuite(EventListener listener, ITestFilter filter)
at NUnit.Core.TestSuite.RunSuiteInContext(EventListener listener, ITestFilter filter)
at NUnit.Core.TestSuite.Run(EventListener listener, ITestFilter filter)
at NUnit.Core.SimpleTestRunner.Run(EventListener listener, ITestFilter filter)
at nCrunch.TestExecution.Frameworks.NUnit.NUnitTestFramework.#=qiRaO95hMU_NKiz9fhSn1tZiGseNaUPKscSzJwth8ThI=.#=qVl6GJZE$6kQEYsal_I6mkA==()
at #=qV4IY3Yw5t4EgaYNhxDl$mQCLZnuJSlEmqrATHMaf9kuVN$GE5NX224lFVpTAvNkQ.#=q$6XPpuVURa0ezT6uQzqgDwmM9wPuWSG4j0sPkq0XzSM=(Action #=qCQqo10P9uAVt1mjisBx_vzZH4DIuv1TwklAer7L4qog=)
at nCrunch.TestExecution.Frameworks.NUnit.NUnitTestFramework.RunTests(TestOutput output, IList`1 testsToRun, MasterExecutionMapSet masterMapSet, Boolean considerInconclusiveTestsAsPassing)
at nCrunch.TestExecution.TestRunnerThread.#=qrunPHTClepwZQbgbb46aOA==(IMasterExecutionMap[] #=q6lwWDhlwcyIoeH1qADH271XREPxtA9PvlShczv8M39E=, IList`1 #=qKY93wGIDiTfNlLEKDFnuhg==, Boolean #=qWtjeCDb5$CN5QWbxqDrGiavS4BNJFchDz5s1sqYaKn6fvmPwLoe9Wj4C$wzzLLOb)