What does "stop working" mean?

Perhaps calculation is set to manual. Check your Excel options (the specific
instructions depend on the version you are using).

Regards,
Fred

"Toby John" <Toby wrote in message
...
=IF(D11="","",D10)
this function used to work fine then all of sudden it just stopped
working.
any one know what can cause this and what to do about it?