Not able to record when attaching to running WPF application. 
More details and repro steps in the internal description.

The following is in the log: 

[12/05 09:22:54,Systematic.DMS.DMSPortal.exe(3464:51),Recording] TranslatorsCache.BuildTranslatorMatchLookup() : WARNING: Duplicate host cache key detected
[12/05 09:22:54,Systematic.DMS.DMSPortal.exe(3464:51),Recording] TranslatorsCache.BuildTranslatorMatchLookup() : WARNING: Duplicate host cache key detected
[12/05 09:23:03,Systematic.DMS.DMSPortal.exe(3464:51),TestStudio] TranslatorsCache.CollectHostsToCache() : EXCEPTION! (see below)
     Outer Exception Type: System.NullReferenceException
     Message: Object reference not set to an instance of an object.
     HRESULT: 0x80004003 (Official ID (if app.) = E_POINTER, Error Bit = FAILED, Facility = FACILITY_NULL, Code = 16387)
     Call Stack:
          at Telerik.TestingFramework.XamlExtension.TechSpecific.DispatcherInvoke(Dispatcher dispatcher, Delegate call, Object[] args)
          at Telerik.TestingFramework.XamlExtension.ClientServices.SerializeNode(DependencyObject root, StringBuilder sb, List`1 popups)
          at Telerik.TestingFramework.XamlExtension.ClientServices.SerializeAllVisualTrees()
          at ArtOfTest.WebAii.Wpf.WpfWindow.RefreshVisualTrees()
          at ArtOfTest.WebAii.Wpf.WpfWindow.EnsureStateIsCurrent()
          at ArtOfTest.Common.Design.Translation.TranslatorsCache.CollectHostsToCache(IAutomationHost rootHost)