Whenever I create a new title in Adobe Premiere CS 5.5, title designer doesn't pop up. Even when I double click the created title in timeline, the designer box doesn't show.

The designer box like the below:

http://www.mediacollege.com/adobe/premiere/pro/tit...

Does anyone know how to fix this? Funny thing is, I tried with other project and those actually work, but for this one particular one, the title designer doesnt open.

Thanks

One thing to note, it was actually working untile yesterday.