I recently took part in making a typography on my AE CS4, was about finished until the camera was acting up.
From previous experiance your supposed to make a camera layer, then a null object and parent it and start animating.
For myself it refused to animate my project; even when all layers are in 3D.
Have you got the Composition view window set to "Current Camera"?
I agree with Andrew - you are simply in the wrong view. Other than that I could only think of insufficient OpenGL capabilities not refreshing the comp properly, so turn it off, if used.