This has been corrected in later releases.
The only work-around I know is to let the grid initially draw, and then set the colwidth. This does cause a flash as the grid displays.
//bottom of formload
Timer t = new Timer();
t.Interval = 10;
t.Tick += new EventHandler(t_Tick);
t.Start();
}
private void t_Tick(object sender, EventArgs e)
{
Timer t = sender as Timer;
t.Stop();
t.Tick -= new EventHandler(t_Tick);
t.Dispose();
this.gridGroupingControl1.TableDescriptor.Columns["Col2"].Width = 175;
}