A customer application sets window.top to null or undefined at some point and thus the test execution fails to verify the state of a checkbox with the following error: 

 Executing step 6 "Verify checked value is 'True' on 'PhysiciansCensusTypeICheckBox'"...
[07/07 09:16:39,ArtOfTest.Runner.exe(60868:4),Error] ExecutionEngine.CatchExecuteStepException() : EXCEPTION! (see below)
     Outer Exception Type: ArtOfTest.WebAii.Exceptions.ExecuteCommandException
     Message: ExecuteCommand failed!
          InError set by the client. Client Error:
          System.InvalidOperationException: Javascript call [((window.top.Telerik && window.top.Telerik.TestStudio && window.top.Telerik.TestStudio.Common && window.top.Telerik.TestStudio.Common.DomProviders && window.top.Telerik.TestStudio.Common.DomProviders.DomProvideFactory && window.top.Telerik.TestStudio.Common.DomProviders.DomProvideFactory.getProvider().getElementByTagNameAndIndex(document, 'input', 33)) || document.getElementsByTagName('input')[33]).checked] failed! Please make sure the function exists and the call is using the correct prototype signature. Javascript error: Unable to get property 'Telerik' of undefined or null reference
          at ArtOfTest.InternetExplorer.IECommandProcessor.InvokeFunction(String functionCall, Boolean useEval, Boolean returnJson, IHTMLDocument2 doc)
          at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessActionCommands(BrowserCommand request)
          at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessCommandInternal(WebBrowserClass ieInstance, BrowserCommand request, IHTMLDocument2 document)
          BrowserCommand (Type:'Action',Info:'NotSet',Action:'InvokeJsFunction',Target:'ElementId (tagName: '',occurrenceIndex: '-1')',Data:'((window.top.Telerik && window.top.Telerik.TestStudio && window.top.Telerik.TestStudio.Common && window.top.Telerik.TestStudio.Common.DomProviders && window.top.Telerik.TestStudio.Common.DomProviders.DomProvideFactory && window.top.Telerik.TestStudio.Common.DomProviders.DomProvideFactory.getProvider().getElementByTagNameAndIndex(document, 'input', 33)) || document.getElementsByTagName('input')[33]).checked',ClientId:'Client_db882bcb-7e2c-45a0-a39c-5eb37cff3119',HasFrames:'False',FramesInfo:'',TargetFrameIndex:'0',InError:'True',Response:'System.InvalidOperationException: Javascript call [((window.top.Telerik && window.top.Telerik.TestStudio && window.top.Telerik.TestStudio.Common && window.top.Telerik.TestStudio.Common.DomProviders && window.top.Telerik.TestStudio.Common.DomProviders.DomProvideFactory && window.top.Telerik.TestStudio.Common.DomProviders.DomProvideFactory.getProvider().getElementByTagNameAndIndex(document, 'input', 33)) || document.getElementsByTagName('input')[33]).checked] failed! Please make sure the function exists and the call is using the correct prototype signature. Javascript error: Unable to get property 'Telerik' of undefined or null reference
          at ArtOfTest.InternetExplorer.IECommandProcessor.InvokeFunction(String functionCall, Boolean useEval, Boolean returnJson, IHTMLDocument2 doc)
          at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessActionCommands(BrowserCommand request)
          at ArtOfTest.InternetExplorer.IECommandProcessor.ProcessCommandInternal(WebBrowserClass ieInstance, BrowserCommand request, IHTMLDocument2 document)')
          InnerException: none.
     HRESULT: 0x80131500 (Official ID (if app.) = COR_E_EXCEPTION, Error Bit = FAILED, Facility = FACILITY_URT, Code = 5376)
     Call Stack:
          at ArtOfTest.WebAii.Core.Browser.ExecuteCommandInternal(BrowserCommand request)
          at ArtOfTest.WebAii.Core.Browser.ExecuteCommand(BrowserCommand request, Boolean performDomRefresh, Boolean waitUntilReady)
          at ArtOfTest.WebAii.Core.Actions.InvokeScript(String script, Boolean refreshDom, Boolean waitUntilReady)
          at ArtOfTest.WebAii.ObjectModel.Element.GetValue[T](String propertyName, T defaultValue)
          at ArtOfTest.WebAii.ObjectModel.Element.GetValue[T](String propertyName)
          at ArtOfTest.WebAii.Controls.HtmlControls.HtmlRadioCheckboxControl.get_Checked()
          at ArtOfTest.WebAii.Design.IntrinsicTranslators.Descriptors.CheckVerificationDescriptor.ExtractData(IAutomationHost targetBrowser, DescriptorValueStore dataStore)
          at ArtOfTest.WebAii.Design.Execution.ExecutionEngine.ExecuteStep(Int32 order)