With Version 515 I am noticing a minor issue with column resizing. Even though the browser has focus I have to sometimes click on the column heading in order to get the column resize cursor to appear.
i.e. it is a normal cursor even on mouse hover over a gutter between columns in the grid header. But a one time click on any of the headers will restore the mouse hover action.
True, I have a very busy display with tabs, panels, a Google map, etc. and I do have a lot of features enabled in the Grid: (8 columns):