Hi Chris,
the question was related to PB .NET WCF Client and the error in the Wizzard, so I used the PB.NET Wizzard and the singleWSDL. Things can get bad with imports in "complex" WSDL structures.
The proxy generation also works in Classic with that singleWSDL.
But in general I love to use SAOP UI and to see or test the C# / VB.NET stuff.