Symbol position issue in Edge animate (was:Positioning problem)

Hi

I have created a Symbol with no padding and I position it precisely in the middle of the animation: x:0 y:300

Visually the symbol is perfectly aligned.

But when I preview the animation, the Symbol is not perfectly aligned.

If I cheat on the position by setting X:-2 y:299

Then it is aligned perfectly on the final output.

I will send the source files to somebody with an adobe.com email address.

Thank you.