I solve the Problem i guess...
I installed an new Joomla Version with a new Database, then i installed CB new and copied after that the old Database in the new. That works and antispam shows on the registration Page.
Then i copied step by step all the other Components, Modules, Plugins, Libraries and so on from the old Joomla in the new to see where the Error comes from. But there wasnt any.. At the End i had all the Extensions and Files in the New and all the Features (like Antispam) works well.
I think it was an Problem in the Joomla Core itself.
Thanks for your Time and Help! =)