"Duplicate Step" does not work in sequences for CI 7.1
Creating a step and duplicating it when making a sequence does not work in Creo Illustrate 7.1 . A new step is created with a correct looking timeline in the keyframe editor but it does not actually play the step.
The current workaround is to create a new step and then copy the timeline from the keyframe of the original step, and paste it into the keyframe editor of the new step.
This is also what must be done if you want to have step 1 to have certain actions and step 2 reverses all of them, you must use the above workaround and then click "reverse step" on the new step.

