1. make sure it's the top most layer
2. make sure the picture is color restricted
3. does it work on any other pictures?
4. there's a section for photoshop help
5. did you click and drag a box to open space for the text?
In photoshop cs3 when i click the text button then type something it does'nt shows up on the layer even i change the color of the text to white , yellow blue etc.
1. make sure it's the top most layer
2. make sure the picture is color restricted
3. does it work on any other pictures?
4. there's a section for photoshop help
5. did you click and drag a box to open space for the text?
Sounds like the color of the text or the blend is wrong, you have a smaller than visible size or you have just an active layer above blocking your visible image.
I see you are working with animation, try it in another project and see if it works, if it doesn't, you've done something wrong with your gif.