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If an arrow key or the PageUp/PageDown key is pressed while a redraw of a map is in progress, the application will crash if it uses the LabelPlacer object.
Using the arrow keys to pan will cancel a redraw of the map that is in progress. This appears to cause an exception in MOPlus.DLL.
Set the CancelAction property to moCancelNone when the form with the map is loaded:
Map1.CancelAction = moCancelNone