If I apply the MovieTexture to a Plane I can hear the sound meanwhile in a GUITexture I can only see the movie. Why is it different?
If I remember correctly the sound must be added separately, it’s basically a gif you get with a movie texture you see, so just add an audio source to the same place and add the sound, hope this helps
Are you sure you have set your AudioSource component to 2D? Just check the settings by expanding the “3D Sound settings” and make sure the “Pan Level” is 0. If you have multiple audiosources in the scene, you can increase the priority by setting the Priority value to a lower value.
Are you sure you started both, the texture and the audio after you assigned the texture / AudioClip?
I never used a MovieTexture myself, but that’s all i can imagine at the moment.