After I change the initial width/height and x/y center of a still image, I am unable to change these settings or add new keyframes with different settings. Additionally, the Lock Aspect Ratio and Size About Center buttons disappear. The Position area is grayed out and Rotation, Keyframe Inerpolation, and Source are no longer available. Path shows up but all of its options are also grayed out. The only area that is accessible is Workspace. What am I doing wrong? Thank You.