D'oh! A piece of code I copied and pasted into the grid ClickCell event handler to implement the context menu was selecting the row. Everything works great now. Thanks again, Alan.

        private void ultraGrid1_InitializeLayout(object sender, Infragistics.Win.UltraWinGrid.InitializeLayoutEventArgs e)
        {
            var layout = e.Layout;
            var ov = layout.Override;

            ov.ActiveCellAppearance.Reset();
            ov.ActiveRowAppearance.Reset();
        }

Thanks, Mike. How do I turn off the default ActiveCellAppearance and ActiveRowAppearance in code?

Nicholas,

If it was just the appearance of the grid, I would think that you might be looking at the activation of the row which would still happen when selecting only a single cell.  As the values for the entire row are being pasted, I would assume that somehow the entire row is being selected in your grid though with the code provided I wouldn't expect that to happen.  Are you able to reproduce the behavior with the same code in an isolated sample that you could provide for me to debug to see what is happening.  I did test the individual settings when I first responded though I didn't get the behavior you are describing.