[Chris Fork]

It´s an After Effects Issue.

Do the following:

1) Save your After Effects Projects and close After Effects.
2) Restart your Computer.
3) Open Adobe Bridge directly from the Start Menu.
4) Go to:

C: -> Programs (x86) -> Adobe -> Adobe After Effects CS4 -> Support Files -> Presets -> Text -> Animate In -> click on “Raining Characters In.ffx”

5) In the right upper corner under “Preview” the sample animation should start play.
6) KEEP Bridge open and open After Effects.

Preview of the Effect should work now in After Effects as well!

Cheers Chris.