It appears that there is a Bug in PrE 12's Titler, when using Styles. If you are encountering this Bug, please see: http://muvipix.com/phpBB3/viewtopic.php?f=103&t=12456&p=106115&hilit=text+style#p106115
Good luck,
Hunt
Adobe has released an Update for PrE 12, named 12.1, and it seems to have fixed this Bug.
Hunt