Can not see text in Excel when cell format is set to wrap text

[Mark]

When I select wrap text in format cell, or open an Excel file with wrap
texted, the text is not visible. Tried changing row height & column width,
but does not help.

 

[Gary''s Student]

One way to make text "invisible" is to set the text font color the same as
the background color.

Make sure this is not happening.
Make sure the text is not heavily indented
Make sure there are not an excessive number of hard returns at the beginning
of the text.