If you applied a fill color (even white), then the borders won't appear.

But personally, I turn off the gridlines and I apply borders
(format|cells|border) so that I can make it look exactly like I want.

TheRockman wrote:

I have created a spreadsheet to use for a daily checkup for our
business...but osme of the gridlines have disappeared. Some of the cells
will have gridlines on only 3 sides of the cell. There is a huge section
that is totally blank with no gridlines at all.

--

Dave Peterson