Choral Public Domain Library

Does anyone know what has happened to the table sorting functionality in (e.g.) http://www.cpdl.org/wiki/index.php/Carols_for_Choirs_1 ?
The last time I looked (about a year ago), the contents table was sortable on each column. The line at the start of the table is still in place, but the sorting buttons do not appear.
In case it is a browser issue, I am using Safari Version 6.0.4 on Mac OS X version 10.7.5

To complete the sortability, you need to begin each header with "!" rather than "|" ... I've fixed the table for you.

How did I miss that?
It looks as if I have made the same error in several places: "find and fix" time, I think!