Shared workbook - font size problem
 

We run a shared work book which is open by 3 or 4 people at any one time.
When my workbook is updated with other users' changes, the text they have
typed into a cell appears tiny - sometimes as small as 5 point - despite the
fact that everyone's font sizes are all set to one standard size & type, and
the font displays correctly on their machine.
Any ideas how to fix this?