We have a grid with grouped totals enabled, and occasionally (perhaps once every few days) one of our users gets the below exception thrown. The stack trace indicates a possible bug in the CalcEngine code. Any assistance on understanding and helping solve this issue will be appreciated. Thanks.

Message: Index was outside the bounds of the array.

Type: System.IndexOutOfRangeException

Source: mscorlib

TargetSite: Void Insert(TKey, TValue, Boolean)

StackTrace:    at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)

   at Infragistics.Win.CalcEngine.UCRecalcChain.HSparseArray.SetOwnerData(Object item, Object ownerData)

   at Infragistics.Shared.SparseArray.InsertRange(Int32 index, ICollection items)

   at Infragistics.Shared.SparseArray.Sort(IComparer comparer)

   at Infragistics.Win.CalcEngine.UltraCalcEngine.TopologicalSort()

   at Infragistics.Win.CalcEngine.UltraCalcEngine.ClearDirtyChainAndDoTopologicalSort(Boolean isStartOfRecalcOperation)

   at Infragistics.Win.CalcEngine.UltraCalcEngine.Recalc(Int64 ticks, Boolean isStartOfRecalcOperation)

   at Infragistics.Win.UltraWinCalcManager.UltraCalcManager.ReCalcInternal(Int64 ticks)

   at Infragistics.Win.UltraWinCalcManager.UltraCalcManager.ReCalc(Int64 millis)

   at Infragistics.Win.UltraWinCalcManager.UltraCalcManager.onTimerTick(Object sender, EventArgs e)

   at System.Windows.Forms.Timer.OnTick(EventArgs e)

   at System.Windows.Forms.Timer.TimerNativeWindow.WndProc(Message& m)

   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)