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Invisible column border in WPF xamGrid

We have several xamGrids in our application but one (which just has text columns) is missing the border between two of the columns.

The columns can be moved, hidden, shown and resized OK. In some cases the border reappears, but for the most part it's missing.

The definition of the grid is no different to other grids that display fine.

<ig:XamGrid x:Name="LocationsXamGrid"
            DataSource="{Binding LocationsDataSource, Mode=OneWay}"

What have we missed in this case?