Page break settings not honored

[David Frost]

I have a spreadsheet where I have set the page breaks
(using page break preview) to go out to column AU and
saved the file. On some PCs, when I open the file and go
to page break preview the page breaks remain how I
originally set them. On other PCs, the page break line
does not include column AU. Is this page break setting
not saved as an attribute when the file is saved? Could
there be a setting on the PCs that override it?