Ctr+Del not working to delete word right of cursor

Hi all,

I recently updated an FCK instance and Ctrl+Del stopped working. I was updating a really old version, so I did not copy the old config file over, but rather went through it and managed things manually. The only line I can find which has anything to do with the Delete button is

[ SHIFT + 46 /*DEL*/, 'Cut' ]

but this seems to configure a combination of the Shift and Delete buttons.

Any idea what could be wrong?

Cheers,
Nickolay