If you have been adding shadows to your text in PowerPoint 2007, you may find problems animating them. For instance, when you add an entrance effect (Fade) to the text, the text fades in while its shadow does not.
The solution to this would be making a habit to add your text shadow through the Text Effects instead of the Shape Effects. When double clicking on the textbox, the Drawing Tools tab will appear. If you have added the shadows through shape effects, remove it.
This time round, add the shadows from the Text Effects under WordArt Styles.
Figure 1: Text Effects button