IssueTracker

I have the following spreadsheet function:

function ssName() {
  var spreadsheetName = SpreadsheetApp.getActiveSpreadsheet().getName();
  return spreadsheetName;
}

In this spreadsheet I have several instances of the function being called
https://docs.google.com/spreadsheet/ccc?key=0AtK6ilf0g9SSdHBQV1BuM2hVelhONV9hY1JLVVlYU2c#gid=0

I would expect to see the same spreadsheet name in column B
Instead I see the name of the spreadsheet that was current at the time the function was added to the cell.
Refreshing the page doesn't fix it.
If you delete the cell entry and re-enter the function you get the same result. If you put the function in a cell that has not been used before, you get the correct result

Project key (found under "File > Project properties"):
MQeuaV-NGVN3eTioaZHtpzQR9xTBF7lDj

On which browser & OS?
Chrome, W7

Please provide any additional information below.