back and forth

Trying to get and object to move back and forth in etoys.  Something simple like:
forward 50
forward -50

It appears to do nothing.  When I go to the code level and add a wait:

forward 50
(Delay forSeconds: 1) wait
forward -50
(Delay forSeconds: 1) wait.


Still nothing.  Any ideas what I am doing terribly wrong?

-david-

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