Gnome/Emacs: <ctrl>-_ not working?

[Leif Hedstrom]

Hi,

I'm running "rawhide" FC, and as of about a week ago or so, the key 
bindings for "Undo" in Emacs (<ctrl>-_) no longer works (it echoes back 
an _ character). I'm 100% positive I have not changed anything in my 
.emacs configurations. I'm using Gnome, so I'm guessing something is 
intercepting the key before it hits emacs?

Any ideas?

Thanks,

-- Leif