hi, anonymous !

I would not know to create a working environment exactly the same as yours
where I could try to reproduce the behavior you describe, however, what you comment...
I have only seen when configuring a worksheet if you set their margins smaller to 2.5 centimeters (1 inch)
and the book is saved in version 97/2000 and later that same workbook is opened in version 2002 (or above)
where they get lost the margins settled down in previous version

if any doubts (or further information)... would you please comment ?
regards,
hector.

__ OP __
This workbook with aroun 30 worksheets
All of them 1 page.
To print in one page.
Today all of the sudden the margens of the worksheet are wider
(living out of the page information) and longer (living out information at the bottom too).
If printing one page, I get 2 due to the excess.
I opened the workbook a couple of times and it came good (each sheet in one page).
Then opened it again and had the same problem.
Why this behavior, and how to fix it ?
ps. all worksheet are extended all the way, across and down on the margens.