Thanks for the answers to my problem. I try to resume:

The MD5-Hash of my downloaded iso is correct.

Starting cinerella in terminal gives me no error messages, only the
normal text.

I tried my download-iso with two other computers with this result:
Cinerella's menu don't work. But, after opening the "configure"- Menu,
starting "Language" und closing the window, cinerellas menus worked! I
have no idea why!

I downloaded the "video.dyne"-modul from the dyne-website and copied it
in the dock on my computer... cinerellas menus don't work :-((

Anyone any idea to help me?

Thanks for your help,

Markus