I have created several motion tweens in my .fla all using the same
symbol.
At the beginning and ending keyframes, the changes to the symbol are
:size, alpha(either 0 or 100%), and screen position.

The ----> for all tweens show to be correct
When I scrub the .fla all the tweens transitions look fine.

When I use "Ctrl + Enter" to play it, some of the tweens leave
partial outlines of its shape on the screen as it goes through its
transition.

Thanks for any assistance you can provide.