like show-paren-mode?

[Matthew Calhoun <calhounm@mac.com>]

Hello,

I recently built the OS X Carbon-enabled Emacs from CVS, and it's doing 
something new that I haven't been able to figure out. There is 
something that's like show-paren-mode, but not show-paren-mode, that's 
highlighting parenthesis contents in light blue when I'm at an opening 
or closing paren. I do have show-paren-mode turned on, but I'm not 
telling it to highlight in light blue, and even when I explicitly turn 
it off, my parentheses still get highlighted.

Any idea what this might be? Or better yet, hints as to how I might 
figure it out for myself?

Thanks,
Matt