Hi trusskev,
Select (click in) any cell in the table. Click on the down arrow on any column letter.
If this does not work,
Or if this does not work,
then:
- Numbers needs a Quit and restart; or
- their machine needs a restart; or
- their copy of the file is corrupt. Send them a fresh copy.
If none of those resolve the problem, please call back with more details.
Regards,
Ian.