Grid lines are missing from some or all of a 123 spreadsheet.
This can be manually set on and off. Take care when in the properties and selection menus.
Resolving the problem
If grid lines are missing from the entire sheet , select the pull down menu Sheet -> Sheet properties
Select the View tab and check the grid lines box, and make sure that an appropriate color is selected from the color box next to the grid lines check box.
They can be set for default values in the view preferences as well.
Go to the view pull down menu -> View Prefrences
If they are missing from the section, select a cell on the outer edge of the
Select the view pull down menu -> Titles and uncheck freeze box.