I wonder if this is something in your .emacs? I've tried it and haven't gotten it to work.
This brings a couple other lingering emacs config questions to mind.
Does anyone know what is the way to jump to the end of the current function in C mode?
Also, what do you have to configure so that alt-D deletes the current word? Both ctrl-D and alt-backspace work fine, but for some reason at some point alt-D stopped working for me.