Hi,
I saw your video attached here -- It's cool that you are a C++ instructor ( I had flashback on my good old days ).
Now lets get to your problem--
To get rid of the border that is coming around your project (not animation but project)
1) Go to Source CPTX file.
2) Project -- Skin Editor-- border
3) Uncheck Show borders.
Regarding your animation, Can you share the same with me if possible so that I can check it. if not,
probably check if there are any border properties in it. Can you try to insert this Widget/Flash animation in CP source file rather than separately in the published output?
Thanks,
Anjaneai