Published Titles Broken

I've been working on a FCPX project for weeks that has a lot of Motion Title projects published to it. They're Lower 3rds and have been working fine. Suddenly, all of them are broken— nothing but a white band across the screen. Even when I bring in a new instance into a fresh new FCPX project, same thing. I can see that all of my customizing of my published settings are still the same. But all I get is white.

I haven't done anything different to my Mac. Tried trashing the FCPX prefs. Didn't help. Shut down the computer—nothing.

Anybody heard of this? Thanks.