Accessible login stopped working

[Nolan Darilek]

As of a couple days ago, Orca stopped launching at my login screen. I 
don't immediately see anything in /var/log/lightdm when I grep for orca, 
other than an error from Oct. 11. Nothing from my most recent launches.

I'm wondering if whatever configuration file that launches Orca on login 
might have gotten trashed? Where should I find this file? I see no 
mention of "orca" in /usr/share/XSessions. Should I?

Is there anywhere else that I might look?

And has anyone else experienced this? I'm on 12.10 and am regularly 
applying updates. Accessibility works as well as it always has once I'm 
logged in, but I'd very much like it back at my login screen.

Thanks.