Blue underline indicates a hyperlink. Select the table cell and
press Ctrl+Shift+F9 to convert the hyperlink back to normal text.

Or if you don't want Word to automatically convert text into
hyperlinks, then in Word click on Tools | AutoCorrect Options |
AutoFormat As You Type | uncheck the "Internet and network paths
with hyperlinks" box | OK.

Emerald53 wrote:

I have a table set up to mimic spine labels for library books. The formatting
is similar throughout the table, with the exception of the last three
vertical rows, but that's neither here nor there. What happens every so often
is that within one cell (for one label), the formatting changes to e x p a n
d e d text and has a blue underline. I can't for the life of me change it
back to the way i want it.

Can anyone help? Thanks in advance!