Excell seems to be hiding rows on it's own. When I try to Unhide the rows or
set the row height, nothing happens. I have about 1200 rows in the sheet but
it's hiding about 600 rows. I can manually mouse click on the row to unhide
the data but once I save the file it hides other (seemingly random) rows. All
the users are experiencing the same problem with this workbook.

The workbook is shared (I am the author), and not protected.

HELP!!!