Option (radio) buttons do not show up when printed

[scatchpole]

Hi
This may be a simple question, and I suspect I am missing something obvious but it is becomming very frustrating.

I am working in Excel 2007 but saving as a 2003 Template

I have an excel sheet which contains 4 Option Buttons. These show up on screen, they show up on print preview but do not appear when the sheet is printed.

I have set the properties and made sure the "Print Object" button is checked.

These buttons used to print, then I made some changes to the sheet (only additional text and a small macro to automatically insert a number into a cell) and now they do not print.

To make this even stranger, they print from some machines but not others. They used to print from all machines and no settings were changed.

As I said I am sure I am missing something obvious!

Thanks for your help

Sam