Using Excel 2007 - I have a large workbook with 23 worksheets - been using it
for years and have succesfully converted to .xlsx format for a long time and
use it every day.

All of a sudden every empty cell, and any cell not specically formated, in
every worksheet has a default cell format of Date. Every blank column and row
or any cell with not a specific format.

How did the default cell format for this workbook become set to 'Date' from
'General' and how do i fix it?

Any new workbook created is OK.. defaults to 'General' - But, if I add a new
blank worksheet to this particular workbook... it defaults to 'Date' format.

Thanks in advance for any guidance.

B Smith