Whilst you got around it this time, it would pay for you to understand the original problem, as you’re bound to come across it again.
The issue you had stems from the order in which FCP process. Effects come after Motion Tab.
From the online help: (When it says ‘rendered’ read ‘processed’ for a better understanding)
Order of Effects Rendering
When you render effects in a sequence, they’re rendered in the following order:
The top video track (the highest-numbered track) is rendered first and then composited onto the track below.
Within each track, effects are rendered as follows: speed, filters, motion, motion blur, opacity, and transitions.
You can change the order of rendering by using nested sequences. For more information, see Sequence-to-Sequence Editing.
This is why you should take note of Kent’s workaround.
Neil.