Hidden Columns in Shared Workbooks

We have noticed inconsistencies with respect to hidden columns for shared
workbooks. One of our office personnel cannot open a shared workbook without
all hidden columns changing to unhidden. The workbook has been saved with
hidden columns and opens as such for most users. If the user in question
opens the workbook, the columns are unhidden. If she hides the columns,
saves the workbook as unshared, closes the workbook, and reopens it, the
columns remain hidden. If however she hides the columns, saves the workbook
as shared, closes the workbook, and reopens it, the columns appear unhidden.
The other two users of this shared workbook do not have this problem. All
users are running Offce Excel 2003. Any help is greatly appreciated.
Thanks.