I have a editable autocomplete combo bound to an IEnumerable under the current 2014.1 version.
Everything works fine.. however after I change the value three times by selecting different values in the combo I get this error:

System.NullReferenceException:  "Object reference not set to an instance of an object." 
   at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
   at MS.Internal.XcpImports.UIElement_Measure(UIElement element, Size availableSize)
   at System.Windows.UIElement.Measure(Size availableSize)
   at Infragistics.Controls.Editors.ComboEditorBase`2.InvalidateDropDownPosition(Boolean adjustHeight)
   at Infragistics.Controls.Editors.ComboEditorBase`2.DataManager_DataUpdated(Object sender, EventArgs e)
   at Infragistics.DataManagerBase.OnDataUpdated()
   at Infragistics.DataManager`1.ApplyClientDataManipulations(Boolean setSortedFilteredDataSource)
   at Infragistics.DataManager`1.ResolveFilteredSortedPagedDataSource()
   at Infragistics.DataManagerBase.InvalidateSortedFilterdDataSource()
   at Infragistics.DataManagerBase.ClearCachedDataSource(Boolean invalidateTotalRowCount)
   at Infragistics.DataManager`1.ClearCachedDataSource(Boolean invalidateTotalRowCount)
   at Infragistics.DataManagerBase.set_Filters(RecordFilterCollection value)
   at Infragistics.Controls.Editors.ComboEditorBase`2.SearchAndFilterItemsByText(String text, Boolean performAutoComplete)
   at Infragistics.Controls.Editors.ComboEditorBase`2.ProcessEditorText(Boolean allowDropDown, Boolean attemptAutoComplete)
   at Infragistics.Controls.Editors.ComboEditorBase`2.ProcessEditorText(Boolean allowDropDown)
   at Infragistics.Controls.Editors.ComboEditorBase`2.Editor_LostFocus(Object sender, RoutedEventArgs e)
   at MS.Internal.CoreInvokeHandler.InvokeEventHandler(UInt32 typeIndex, Delegate handlerDelegate, Object sender, Object args)
   at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName, UInt32 flags)