As a temporary work-around one can manually add the following registry key, see attached. System.ArgumentNullException: Value cannot be null. Parameter name: path1 Result StackTrace: at System.IO.Path.Combine(String path1, String path2) at ArtOfTest.WebAii.Messaging.Process.HostsProxy.Start() at ArtOfTest.WebAii.Messaging.Process.HostsProxy.RegisterListener(MessageListener listener) at ArtOfTest.WebAii.Messaging.Process.ExecutionMediator.RegisterManager(Manager manager) at ArtOfTest.WebAii.BrowserSpecialized.Chrome.ChromeActions.LaunchNewBrowserInstance(Manager manager) at ArtOfTest.WebAii.Core.Manager.LaunchNewBrowser(BrowserType browserToLaunch, Boolean waitForBrowserToConnect, ProcessWindowStyle windowStyle, String arguments) at ArtOfTest.WebAii.Core.Manager.LaunchNewBrowser()