I have a problem. I have in excel 07 created a document which contains drop-down menus, and they work perfectly. When i send the document to my collegue, who use excel 10, the drop-down menus (and everything else) works perfect, but when he makes changes and saves the document, some of the drop-down menus dissapear when i open it in 07.
The changes my collegue make are NOT in the drop-down menus.

Any ideas of what goes wrong?