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this.gridGroupingControl1.TableDescriptor.VisibleColumns.LoadDefault();
this.gridGroupingControl1.TableDescriptor.VisibleColumns.Remove("Col4");
in the sample, and tried both
this.gridGroupingControl1.TableControl.Model.Cols.Hidden["Col4"] = true;
and
this.gridGroupingControl1.TableModel.Cols.Hidden["Col4"] = true;
but was not able to see the lock up with either line of code. What version are you using when you run the sample and see the problem? (I am using 3.2.1.0).