Russ, thanks for chipping in.
Reineke, you could also open the WSDL file in the WSDL editor and check for any warnings and error markers, even in your current version of ME. Please pay special attention to the warnings.
The Wizards carry on the same validation that is possible in the editor, but marks up certain warnings had to notice in the editor.
If you’re still running into issues, can you paste the stack trace here (see the Error Log view).