[AUCTeX] latex-math-mode extra curly braces

[Chris Poole]

Hi,
Whenever I use a shortcut key, such as "` a" in math mode (here, to  
create \alpha), I end up with two curly braces to the right of what I  
want (i.e., \alpha{}).

I'm using a build of carbon emacs with AUCTeX already installed.

I tried stopping my .emacs from running to see if anything I've done  
is causing this to happen, but it seems now.

What am I doing wrong?

Thanks.