Sometimes I'm getting an IndexOutOfBoundsException, I wasn't able to reproduce in the demo editor, but I'll give you the stacktrace anyway. Maybe you can track this down. It's in version 1.2.0:
System.IndexOutOfRangeException was unhandled
HResult=-2146233080
Message=De index ligt buiten de matrixgrenzen.
Source=unvell.ReoGrid
StackTrace:
bij unvell.ReoGrid.Data.Index4DArray`1.a(Int32 A_0, Int32 A_1)
bij unvell.ReoGrid.Worksheet.CreateAndGetCell(Int32 row, Int32 col)
bij unvell.ReoGrid.Worksheet.CreateAndGetCell(CellPosition pos)
bij unvell.ReoGrid.Worksheet.GetMergedCellOfRange(ReoGridCell cell)
bij unvell.ReoGrid.Worksheet.MoveSelectionPageDown(Boolean appendSelect)
bij unvell.ReoGrid.Worksheet.b(KeyCode A_0)
bij unvell.ReoGrid.ReoGridControl.OnKeyDown(KeyEventArgs e)