Problem

If a value is changed in the 'Preferences > System configuration', the new value is not shown until the grid is manually reloadedy, so user who changed the value always needs to click the Reload button to see the value just updated in the grid - is actually in the grid.

Solution

Fresh value should appear in the grid right after update, with no further action needed from the user who changed the value. This can be done either via cell renderers or via auto-click on Refresh button.