Multimedia not working in Reader 11

I created PDF files with Acrobat Pro 9 which include both movies and Flash animations (which are opened through buttons using the "Multimedia Operation" in Acrobat 9).

Those integrated animations and movies work perfectly if I open the PDF files with Reader 9 or 10 but NOT in Reader 11.

I want to know why as customers who upgrade to Reader 11 are getting angry.

Thanks in advance to anyone who can help.