[Zope] problem with 2.2.0b1

I just tried the new 2.2.0b1, and most imported things from my 2.1.6 installation are running fine, including all sql-methods. But: when I choose one sql-method from the management interface or try to add a new one, i get the following error-message: "Warning: There are no SQL database connections. You need to add a Zope SQL database connection before you can use a Zope SQL Method. " Thats funny, because I know, that the DB connection is up and running. Any Idea? Harald