Just curious if any of you have experienced this behaviour. Using a simple expression, I have a property within a PreComp linked to an Expression Control Slider in the Parent comp. The link is fine- Slide the parent Comp slider and the property within the PreComp follows along nicely. However, the minute I add keyframes to the Expression Control Slider in the Parent Comp, the PreComp property doesn't update. It just sits there at whatever its value was before you added the keyframe/s. Delete the keyframes and it suddenly begins updating to the correct value again.