Remember not all browsers support gif89a animations.
Some browsers display the last frame, and some browsers display the first frame of an animation.
To accomodate all browsers, make sure that the first and last frames of the animation are legible. You can copy and paste a frame very easily. Then select the block before where you want to place the frame. Be sure to cut and paste a Control Block for the frame of animation as well. You can easily set the number of times an animation repeats.