Step 10, a Click step, of a specific customer test always yields:
'9/9/2015 3:24:47 PM' - 'Fail' : 10. Click 'Home'
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Failure Information: 
~~~~~~~~~~~~~~~
ExecuteCommand failed!
InError set by the client. Client Error:
mozCommandProcessor: ProcessInformationCommand(): Document is not ready to retrieve its markup.
BrowserCommand (Type:'Information',Info:'DocumentMarkup',Action:'NotSet',Target:'null',Data:'',ClientId:'6dfb9c55-7249-4ee0-ae48-399a318b7eaa',HasFrames:'False',FramesInfo:'',TargetFrameIndex:'-1',InError:'True',Response:'mozCommandProcessor: ProcessInformationCommand(): Document is not ready to retrieve its markup.')
InnerException: none.

InnerException:
ArtOfTest.WebAii.Exceptions.ExecuteCommandException: ExecuteCommand failed!
InError set by the client. Client Error:
mozCommandProcessor: ProcessInformationCommand(): Document is not ready to retrieve its markup.
BrowserCommand (Type:'Information',Info:'DocumentMarkup',Action:'NotSet',Target:'null',Data:'',ClientId:'6dfb9c55-7249-4ee0-ae48-399a318b7eaa',HasFrames:'False',FramesInfo:'',TargetFrameIndex:'-1',InError:'True',Response:'mozCommandProcessor: ProcessInformationCommand(): Document is not ready to retrieve its markup.')
InnerException: none.

   at ArtOfTest.WebAii.Core.Browser.ExecuteCommandInternal(BrowserCommand request)
   at ArtOfTest.WebAii.Core.Browser.ExecuteCommand(BrowserCommand request, Boolean performDomRefresh, Boolean waitUntilReady)
   at ArtOfTest.WebAii.Core.Browser.RefreshDomTree()
   at ArtOfTest.WebAii.Core.Browser.ExecuteCommand(BrowserCommand request, Boolean performDomRefresh, Boolean waitUntilReady)
   at ArtOfTest.WebAii.Core.Browser.ExecuteCommand(BrowserCommand request)
   at ArtOfTest.WebAii.Core.Actions.Click(Element targetElement)
   at ArtOfTest.WebAii.Controls.HtmlControls.HtmlControl.Click()
   at ArtOfTest.WebAii.Controls.HtmlControls.HtmlControl.Click(Boolean isClosing)
   at ArtOfTest.WebAii.Design.IntrinsicTranslators.Descriptors.ClickActionDescriptor.Execute(Browser browser)
   at ArtOfTest.WebAii.Design.Extensibility.HtmlActionDescriptor.Execute(IAutomationHost autoHost)
   at ArtOfTest.WebAii.Design.Execution.ExecutionEngine.ExecuteStep(Int32 order)