Motion paths not triggering

Hi

I set up a motion path to move a graphic when the timeline starts. The trigger is visible at the right in the triggers panel, under the name I gave to the graphic. Works fine.

Then I edited the trigger, to delay the start of the motion path until 7 seconds into the timeline. The trigger moved under the 'Slide triggers' heading, and the motion path no longer works.

Can anyone tell me what I'm doing wrong?